Sections 4 and 5 Citizenship

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    SECTION 4. Citizens of the Philippines who marry aliens shall retain their citizenship, unless

    by their act or omission they are deemed, under the law, to have renounced it.

    LABO V. COMELEC

    The petitioner's contention that his marriage to an Australian national in 1976 did notautomatically divest him of Philippine citizenship is irrelevant. There is no claim or finding

    that he automatically ceased to be a Filipino because of that marriage. He became a

    citizen of Australia because he was naturalized as such through a formal and positive

    process, simplified in his case because he was married to an Australian citizen. As a

    condition for such naturalization, he formally took the Oath of Allegiance and/or made

    the Affirmation of Allegiance, both quoted above. Renouncing all other allegiance, he

    swore "to be faithful and bear true allegiance to Her Majesty Elizabeth the Second,

    Queen of Australia ..." and to fulfill his duties "as an Australian citizen."

    Even if it be assumed that, as the petitioner asserts, his naturalization in Australia was

    annulled after it was found that his marriage to the Australian citizen was bigamous, that

    circumstance alone did not automatically restore his Philippine citizenship. His divestiture

    of Australian citizenship does not concern us here. That is a matter between him and his

    adopted country. What we must consider is the fact that he voluntarily and freely

    rejected Philippine citizenship and willingly and knowingly embraced the citizenship of a

    foreign country. The possibility that he may have been subsequently rejected by

    Australia, as he claims, does not mean that he has been automatically reinstated as a

    citizen of the Philippines.

    DJUMANTAN V. DOMINGO

    The fact of marriage by an alien to a citizen does not withdraw her from the operation of

    the immigration laws governing the admission and exclusion of aliens. Marriage of an

    alien woman to a Filipino husband does not ipso factomake her a Filipino citizen and

    does not excuse her from her failure to depart from the country upon the expiration ofher extended stay here as an alien.

    MERCADO V. MANZANO

    Petitioner Mercado and private respondent Manzano were candidates for vice mayor of

    the City of Makati in the May 11, 1998 elections. The proclamation of private respondent

    was suspended in view of a pending petition for disqualification filed by a certain Ernesto

    Mamaril who alleged that private respondent was not a citizen of the Philippines but of

    the United States. The Second Division of the COMELEC granted the petition of Mamaril

    and ordered the cancellation of the certificate of candidacy of private respondent on

    the ground that he is a dual citizen and under Sec. 40 of the Local Government Code,

    persons with dual citizenship are disqualified from running for any elective position.

    ON DUAL ALLEGIANCE: The disqualification of private respondent Manzano is being

    sought under 40 of the Local Government Code of 1991 (R.A. No. 7160), which declares

    as disqualified from running for any elective local position: . . . (d) Those with dual

    citizenship. This provision is incorporated in the Charter of the City of Makati.

    Invoking the maxim dura lex sed lex, petitioner, as well as the Solicitor General, who sides

    with him in this case, contends that through 40(d) of the Local Government Code,

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    Congress has command[ed] in explicit terms the ineligibility of persons possessing dual

    allegiance to hold local elective office.

    To begin with, dual citizenship is different from dual allegiance. The former arises when, as

    a result of the concurrent application of the different laws of two or more states, a person

    is simultaneously considered a national by the said states. For instance, such a situation

    may arise when a person whose parents are citizens of a state which adheres to theprinciple ofjus sanguinisis born in a state which follows the doctrine ofjus soli. Such a

    person, ipso factoand without any voluntary act on his part, is concurrently considered a

    citizen of both states.

    Considering the citizenship clause (Art. IV) of our Constitution, it is possible for the

    following classes of citizens of the Philippines to possess dual citizenship:

    (1) Those born of Filipino fathers and/or mothers in foreign countries which follow

    the principle of jus soli;

    (2) Those born in the Philippines of Filipino mothers and alien fathers if by the laws

    of their fathers country such children are citizens of that country;

    (3) Those who marry aliens if by the laws of the latters country the former are

    considered citizens, unless by their act or omission they are deemed to have

    renounced Philippine citizenship.

    There may be other situations in which a citizen of the Philippines may, without

    performing any act, be also a citizen of another state; but the above cases are clearly

    possible given the constitutional provisions on citizenship.

    Dual allegiance, on the other hand, refers to the situation in which a person

    simultaneously owes, by some positive act, loyalty to two or more states. While dual

    citizenship is involuntary, dual allegiance is the result of an individuals volition.

    Clearly, in including 5 in Article IV on citizenship, the concern of the Constitutional

    Commission was not with dual citizens per sebut with naturalized citizens who maintain

    their allegiance to their countries of origin even after their naturalization. Hence, thephrase dual citizenship in R.A. No. 7160, 40(d) and in R.A. No. 7854, 20 must be

    understood as referring to dual allegiance. Consequently, persons with mere dual

    citizenship do not fall under this disqualification. Unlike those with dual allegiance, who

    must, therefore, be subject to strict process with respect to the termination of their status,

    for candidates with dual citizenship, it should suffice if, upon the filing of their certificates

    of candidacy, they elect Philippine citizenship to terminate their status as persons with

    dual citizenship considering that their condition is the unavoidable consequence of

    conflicting laws of different states. As Joaquin G. Bernas, one of the most perceptive

    members of the Constitutional Commission, pointed out: [D]ual citizenship is just a reality

    imposed on us because we have no control of the laws on citizenship of other countries.

    We recognize a child of a Filipino mother. But whether or not she is considered a citizen

    of another country is something completely beyond our control.

    By declaring in his certificate of candidacy that he is a Filipino citizen; that he is not a

    permanent resident or immigrant of another country; that he will defend and support the

    Constitution of the Philippines and bear true faith and allegiance thereto and that he

    does so without mental reservation, private respondent has, as far as the laws of this

    country are concerned, effectively repudiated his American citizenship and anything

    which he may have said before as a dual citizen.

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    On the other hand, private respondents oath of allegiance to the Philippines, when

    considered with the fact that he has spent his youth and adulthood, received his

    education, practiced his profession as an artist, and taken part in past elections in this

    country, leaves no doubt of his election of Philippine citizenship.

    His declarations will be taken upon the faith that he will fulfill his undertaking made under

    oath. Should he betray that trust, there are enough sanctions for declaring the loss of hisPhilippine citizenship through expatriation in appropriate proceedings.

    VALLES V. COMELEC

    Rosalind Ybasco Lopez was born on May 16, 1934 in Napier Terrace, Broome, Western

    Australia, to the spouses, Telesforo Ybasco, a Filipino citizen and native of Daet,

    Camarines Norte, and Theresa Marquez, an Australian. In 1949, at the age of fifteen, she

    left Australia and came to settle in the Philippines.

    On June 27, 1952, she was married to Leopoldo Lopez, a Filipino citizen, at the Malate

    Catholic Church in Manila. Since then, she has continuously participated in the electoral

    process not only as a voter but as a candidate, as well. She served as Provincial Board

    Member of the Sangguniang Panlalawigan of Davao Oriental. In 1992, she ran for and

    was elected governor of Davao Oriental. Her election was contested by her opponent,

    Gil Taojo, Jr., in a petition for quo warranto, docketed as EPC No. 92-54, alleging as

    ground therefor her alleged Australian citizenship.

    In the aforecited case ofMercado vs. Manzano, the Court clarified dual citizenship as

    used in the Local Government Code and reconciled the same with Article IV, Section 5

    of the 1987 Constitution on dual allegiance. Recognizing situations in which a Filipino

    citizen may, without performing any act, and as an involuntary consequence of the

    conflicting laws of different countries, be also a citizen of another state, the Court

    explained that dual citizenship as a disqualification must refer to citizens with dual

    allegiance. The Court succinctly pronounced:

    xxx the phrase dual citizenship in R.A. No. 7160, xxx 40 (d) and in R.A. No. 7854, xxx

    20 must be understood as referring to dual allegiance. Consequently, persons

    with mere dual citizenship do not fall under this disqualification.

    Thus, the fact that the private respondent had dual citizenship did not automatically

    disqualify her from running for a public office. Furthermore, it was ruled that for

    candidates with dual citizenship, it is enough that they elect Philippine citizenship upon

    the filing of their certificate of candidacy, to terminate their status as persons with dual

    citizenship. The filing of a certificate of candidacy sufficed to renounce foreign

    citizenship, effectively removing any disqualification as a dual citizen. This is so because

    in the certificate of candidacy, one declares that he/she is a Filipino citizen and that

    he/she will support and defend the Constitution of the Philippines and will maintain truefaith and allegiance thereto. Such declaration, which is under oath, operates as an

    effective renunciation of foreign citizenship. Therefore, when the herein private

    respondent filed her certificate of candidacy in 1992, such fact alone terminated her

    Australian citizenship.

    Then, too, it is significant to note that on January 15 1992, private respondent executed a

    Declaration of Renunciation of Australian Citizenship, duly registered in the Department

    of Immigration and Ethnic Affairs of Australia on May 12, 1992. And, as a result, on

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    February 11, 1992, the Australian passport of private respondent was cancelled, as

    certified to by Second Secretary Richard F. Munro of the Embassy of Australia in Manila.

    As aptly appreciated by the COMELEC, the aforesaid acts were enough to settle the

    issue of the alleged dual citizenship of Rosalind Ybasco Lopez. Since her renunciation

    was effective, petitioners claim that private respondent must go through the whole

    process of repatriation holds no water.

    Petitioner maintains further that when citizenship is raised as an issue in judicial or

    administrative proceedings, the resolution or decision thereon is generally not considered

    res judicatain any subsequent proceeding challenging the same; citing the case ofMoy

    Ya Lim Yao vs. Commissioner of Immigration.

    Petitioner is correct insofar as the general rule is concerned, i.e.the principle ofres

    judicatagenerally does not apply in cases hinging on the issue of citizenship. However, in

    the case of Burca vs. Republic, an exception to this general rule was recognized. The

    Court ruled in that case that in order that the doctrine of res judicatamay be applied in

    cases of citizenship, the following must be present:

    1) a persons citizenship be raised as a material issue in a controversy where said

    person is a party;

    2) the Solicitor General or his authorized representative took active part in the

    resolution thereof, and

    3) the finding on citizenship is affirmed by this Court.

    AASJS v. DATUMANONG

    Petitioner avers that Rep. Act No. 9225 is unconstitutional as it violates Section 5, Article IV

    of the 1987 Constitution that states, "Dual allegiance of citizens is inimical to the national

    interest and shall be dealt with by law."

    PETITIONERS CONTENTION: Petitioner contends that Rep. Act No. 9225 cheapens

    Philippine citizenship. He avers that Sections 2 and 3 of Rep. Act No. 9225, together, allowdual allegiance and not dual citizenship. Petitioner maintains that Section 2 allows all

    Filipinos, either natural-born or naturalized, who become foreign citizens, to retain their

    Philippine citizenship without losing their foreign citizenship. Section 3 permits dual

    allegiance because said law allows natural-born citizens of the Philippines to regain their

    Philippine citizenship by simply taking an oath of allegiance without forfeiting their foreign

    allegiance. The Constitution, however, is categorical that dual allegiance is inimical to

    the national interest.

    From the above excerpts of the legislative record, it is clear that the intent of the

    legislature in drafting Rep. Act No. 9225 is to do away with the provision in

    Commonwealth Act No. 63 which takes away Philippine citizenship from natural-born

    Filipinos who become naturalized citizens of other countries. What Rep. Act No. 9225does is allow dual citizenship to natural-born Filipino citizens who have lost Philippine

    citizenship by reason of their naturalization as citizens of a foreign country. On its face, it

    does not recognize dual allegiance. By swearing to the supreme authority of the

    Republic, the person implicitly renounces his foreign citizenship. Plainly, from Section 3,

    Rep. Act No. 9225 stayed clear out of the problem of dual allegiance and shifted the

    burden of confronting the issue of whether or not there is dual allegiance to the

    concerned foreign country. What happens to the other citizenship was not made a

    concern of Rep. Act No. 9225.

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    JACOT v. DAL

    Petitioner was a natural born citizen of the Philippines, who became a naturalized citizen

    of the US on 13 December 1989.

    Petitioner sought to reacquire his Philippine citizenship under Republic Act No. 9225,otherwise known as the Citizenship Retention and Re-Acquisition Act. He filed a request

    for the administration of his Oath of Allegiance to the Republic of the Philippines with the

    Philippine Consulate General (PCG) of Los Angeles, California. The Los Angeles PCG

    issued an Order of Approval4of petitioners request, and on the same day, petitioner

    took his Oath of Allegiance to the Republic of the Philippines. On 27 September 2006, the

    Bureau of Immigration issued Identification Certificate No. 06-12019 recognizing

    petitioner as a citizen of the Philippines.

    Six months after, on 26 March 2007, petitioner filed his Certificate of Candidacy for the

    Position of Vice-Mayor of the Municipality of Catarman, Camiguin.

    Respondent Rogen T. Dal filed a Petition for Disqualificationbefore the COMELEC

    Provincial Office in Camiguin against petitioner, arguing that the latter failed to

    renounce his US citizenship, as required under Section 5(2) of Republic Act No. 9225,

    which reads as follows:

    Section 5. Civil and Political Rights and Liabilities.Those who retain or reacquire Philippine

    citizenship under this Act shall enjoy full civil and political rights and be subject to all

    attendant liabilities and responsibilities under existing laws of the Philippines and the

    following conditions:

    x x x x

    (2) Those seeking elective public office in the Philippines shall meet the qualifications for

    holding such public office as required by the Constitution and existing laws and, at the

    time of the filing of the certificate of candidacy, make a personal and sworn

    renunciation of any and all foreign citizenship before any public officer authorized toadminister an oath.

    RULING: Contrary to the assertions made by petitioner, his oath of allegiance to the

    Republic of the Philippines made before the Los Angeles PCG and his Certificate of

    Candidacy do not substantially comply with the requirement of a personal and sworn

    renunciation of foreign citizenship because these are distinct requirements to be

    complied with for different purposes.

    Section 3 of Republic Act No. 9225requires that natural-born citizensof the Philippines,

    who are already naturalized citizens of a foreign country, must take an oath of

    allegiance to the Republic of the Philippines to reacquire or retain their Philippine

    citizenship.

    By the oath dictated in the afore-quoted provision, the Filipino swears allegiance to the

    Philippines, but there is nothing therein on his renunciation of foreign citizenship. Precisely,

    a situation might arise under Republic Act No. 9225 wherein said Filipino has dual

    citizenship by also reacquiring or retaining his Philippine citizenship, despite his foreign

    citizenship.

    The afore-quoted oath of allegiance is substantially similar to the one contained in the

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    Certificate of Candidacywhich must be executed by any personwho wishes to run for

    public officein Philippine elections.

    Now, Section 5(2) of Republic Act No. 9225 specifically requires persons seeking elective

    public office, who either retained their Philippine citizenship or those who reacquired it,

    to make a personal and sworn renunciation of any and all foreign citizenship before a

    public officer authorized to administer an oath simultaneous with or before the filing ofthe certificate of candidacy.

    Hence, Section 5(2) of Republic Act No. 9225compels natural-born Filipinos, who have

    been naturalized as citizens of a foreign country, but who reacquired or retained their

    Philippine citizenship (1) to take the oath of allegiance under Section 3 of Republic Act

    No. 9225, and (2) for those seeking elective public offices in the Philippines , to

    additionally execute a personal and sworn renunciationof any and all foreign citizenship

    before an authorized public officer prior or simultaneous to the filing of their certificates

    of candidacy, to qualify as candidates in Philippine elections.

    Clearly Section 5(2) of Republic Act No. 9225 (on the making of a personal and sworn

    renunciation of any and all foreign citizenship) requires of the Filipinos availing themselves

    of the benefits under the said Act to accomplish an undertaking other than that which

    they have presumably complied with under Section 3 thereof (oath of allegiance to the

    Republic of the Philippines).

    MANZANO AND VALLES, MISAPPLICATION: Petitioner erroneously invokes the doctrine in

    VallesandMercado, wherein the filing by a person with dual citizenship of a certificate

    of candidacy, containing an oath of allegiance, was already considered a renunciation

    of foreign citizenship. The ruling of this Court in VallesandMercadois not applicable to

    the present case, which is now specially governed by Republic Act No. 9225,

    promulgated on 29 August 2003.

    The Court in the aforesaid cases sought to define the term "dual citizenship" vis--visthe

    concept of "dual allegiance." At the time this Court decided the cases of VallesandMercadoon 26 May 1999 and 9 August 2000, respectively, the more explicitly worded

    requirements of Section 5(2) of Republic Act No. 9225 were not yet enacted by our

    legislature.

    DE GUZMAN V. DELA CRUZ

    Petitioner De Guzman and private respondent Angelina DG. Dela Cruz were candidates

    for vice-mayor of Guimba, Nueva Ecija in the May 14, 2007 elections. On April 3, 2007,

    private respondent filed against petitioner a petition for disqualification docketed as SPA

    No. 07-211, alleging that petitioner is not a citizen of the Philippines, but an immigrant

    and resident of the United States of America.

    In his answer, petitioner admitted that he was a naturalized American. However, on

    January 25, 2006, he applied for dual citizenship under Republic Act No. 9225 (R.A. No.

    9225), otherwise known as the Citizenship Retention and Re-Acquisition Act of 2003. Upon

    approval of his application, he took his oath of allegiance to the Republic of the

    Philippines on September 6, 2006. He argued that, having re-acquired Philippine

    citizenship, he is entitled to exercise full civil and political rights.

    R.A. No. 9225 was enacted to allow re-acquisition and retention of Philippine citizenship

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    for: 1) natural-born citizens who have lost their Philippine citizenship by reason of their

    naturalization as citizens of a foreign country; and 2) natural-born citizens of the

    Philippines who, after the effectivity of the law, become citizens of a foreign country. The

    law provides that they are deemed to have re-acquired or retained their Philippine

    citizenship upon taking the oath of allegiance.

    Petitioner falls under the first category, being a natural-born citizen who lost his Philippinecitizenship upon his naturalization as an American citizen. In the instant case, there is no

    question that petitioner re-acquired his Philippine citizenship after taking the oath of

    allegiance on September 6, 2006. However, it must be emphasized that R.A. No. 9225

    imposes an additional requirement on those who wish to seek elective public office, as

    follows: a personal and sworn renunciation of any and all foreign citizenship before any

    public officer authorized to administer an oath.

    Breaking down the afore-quoted provision, for a natural born Filipino, who reacquired or

    retained his Philippine citizenship under Republic Act No. 9225, to run for public office, he

    must: (1) meet the qualifications for holding such public office as required by the

    Constitution and existing laws; and (2) make a personal and sworn renunciation of any

    and all foreign citizenships before any public officer authorized to administer an oath.

    Further, inJacot v. Dal and COMELEC, the Court ruled that a candidates oath of

    allegiance to the Republic of the Philippines and his Certificate of Candidacy do not

    substantially comply with the requirement of a personal and sworn renunciation of

    foreign citizenship.

    JAPZON V. COMELEC

    Both petitioner Manuel B. Japzon (Japzon) and private respondent Jaime S. Ty (Ty) were

    candidates for the Office of Mayor of the Municipality of General Macarthur, Eastern

    Samar, in the local elections held on 14 May 2007.

    On 15 June 2007, Japzon instituted SPA No. 07-568 by filing before the COMELEC aPetition to disqualify and/or cancel Tys Certificate of Candidacy on the ground of

    material misrepresentation. Japzon averred in his Petition that Ty was a former natural-

    born Filipino, having been born on 9 October 1943 in what was then Pambujan Sur,

    Hernani Eastern Samar (now the Municipality of General Macarthur, Easter Samar) to

    spouses Ang Chim Ty (a Chinese) and Crisanta Aranas Sumiguin (a Filipino). Ty eventually

    migrated to the United States of America (USA) and became a citizen thereof. Ty had

    been residing in the USA for the last 25 years.

    While Ty may have applied for the reacquisition of his Philippine citizenship, Ty continued

    to make trips to the USA, the most recent of which was on 31 October 2006 lasting until 20

    January 2007. Moreover, although Ty already took his Oath of Allegiance to the Republic

    of the Philippines, he continued to comport himself as an American citizen as proven byhis travel records. He had also failed to renounce his foreign citizenship as required by

    Republic Act No. 9225, otherwise known as the Citizenship Retention and Reacquisition

    Act of 2003, or related laws.

    In his Answer, Ty alleged, among others, that he executed on 19 March 2007 a duly

    notarized Renunciation of Foreign Citizenship.

    RULING: There is no dispute that Ty was a natural-born Filipino. He was born and raised in

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    the Municipality of General Macarthur, Eastern Samar, Philippines. However, he left to

    work in the USA and eventually became an American citizen. On 2 October 2005, Ty

    reacquired his Philippine citizenship by taking his Oath of Allegiance to the Republic of

    the Philippines before Noemi T. Diaz, Vice Consul of the Philippine Consulate General in

    Los Angeles, California, USA, in accordance with the provisions of Republic Act No. 9225.

    At this point, Ty still held dual citizenship, i.e., American and Philippine. It was only on 19

    March 2007 that Ty renounced his American citizenship before a notary public and,resultantly, became a pure Philippine citizen again.

    It bears to point out that Republic Act No. 9225 governs the manner in which a natural-

    born Filipino may reacquire or retainhis Philippine citizenship despite acquiring a foreign

    citizenship, and provides for his rights and liabilities under such circumstances. A close

    scrutiny of said statute would reveal that it does not at all touch on the matter of

    residence of the natural-born Filipino taking advantage of its provisions.Republic Act No.

    9225 imposes no residency requirement for the reacquisition or retention of Philippine

    citizenship; nor does it mention any effect of such reacquisition or retention of Philippine

    citizenship on the current residence of the concerned natural-born Filipino. Clearly,

    Republic Act No. 9225 treats citizenship independently of residence. This is only logical

    and consistent with the general intent of the law to allow for dual citizenship. Since a

    natural-born Filipino may hold, at the same time, both Philippine and foreign citizenships,

    he may establish residence either in the Philippines or in the foreign country of which he is

    also a citizen.

    For a natural born Filipino, who reacquired or retained his Philippine citizenship under

    Republic Act No. 9225, to run for public office, he must: (1) meet the qualifications for

    holding such public office as required by the Constitution and existing laws; and (2)

    make a personal and sworn renunciation of any and all foreign citizenships before any

    public officer authorized to administer an oath.

    That Ty complied with the second requirement is beyond question. On 19 March 2007, he

    personally executed a Renunciation of Foreign Citizenship before a notary public. By the

    time he filed his Certificate of Candidacy for the Office of Mayor of the Municipality ofGeneral Macarthur, Eastern Samar, on 28 March 2007, he had already effectively

    renounced his American citizenship, keeping solely his Philippine citizenship.

    The other requirement of Section 5(2) of Republic Act No. 9225 pertains to the

    qualifications required by the Constitution and existing laws.

    CORDORA v. COMELEC

    Tambunting does not deny that he is born of a Filipino mother and an American father.

    Neither does he deny that he underwent the process involved in INS Form I-130 (Petition

    for Relative) because of his fathers citizenship. Tambunting claims that because of his

    parents differing citizenships, he is both Filipino and American by birth. Cordora, on theother hand, insists that Tambunting is a naturalized American citizen.

    Tambunting possesses dual citizenship. Because of the circumstances of his birth, it was

    no longer necessary for Tambunting to undergo the naturalization process to acquire

    American citizenship. The process involved in INS Form I-130 only served to confirm the

    American citizenship which Tambunting acquired at birth. The certification from the

    Bureau of Immigration which Cordora presented contained two trips where Tambunting

    claimed that he is an American. However, the same certification showed nine other trips

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    where Tambunting claimed that he is Filipino. Clearly, Tambunting possessed dual

    citizenship prior to the filing of his certificate of candidacy before the 2001 elections. The

    fact that Tambunting had dual citizenship did not disqualify him from running for public

    office.

    Requirements for dual citizens from birth who desire to run for public office

    We have to consider the present case in consonance with our rulings in Mercado v.

    Manzano,Valles v. COMELEC,andAASJS v. Datumanong.Mercado and Valles involve

    similar operative facts as the present case. Manzano and Valles, like Tambunting,

    possessed dual citizenship by the circumstances of their birth. Manzano was born to

    Filipino parents in the United States which follows the doctrine ofjus soli. Valles was born

    to an Australian mother and a Filipino father in Australia. Our rulings inManzanoand

    Vallesstated that dual citizenship is different from dual allegiance both by cause and, for

    those desiring to run for public office, by effect. Dual citizenship is involuntary and arises

    when, as a result of the concurrent application of the different laws of two or more

    states, a person is simultaneously considered a national by the said states. Thus, like any

    other natural-born Filipino, it is enough for a person with dual citizenship who seeks public

    office to file his certificate of candidacy and swear to the oath of allegiance contained

    therein.

    Dual allegiance, on the other hand, is brought about by the individuals active

    participation in the naturalization process.AASJS states that,under R.A. No. 9225, a

    Filipino who becomes a naturalized citizen of another country is allowed to retain his

    Filipino citizenship by swearing to the supreme authority of the Republic of the Philippines.

    The act of taking an oath of allegiance is an implicit renunciation of a naturalized

    citizens foreign citizenship.

    In Sections 2 and 3 of R.A. No. 9225, the framers were not concerned with dual citizenship

    per se, but with the status of naturalized citizens who maintain their allegiance to their

    countries of origin even after their naturalization. Section 5(3) of R.A. No. 9225 states that

    naturalized citizens who reacquire Filipino citizenship and desire to run for elective publicoffice in the Philippines shall "meet the qualifications for holding such public office as

    required by the Constitution and existing laws and, at the time of filing the certificate of

    candidacy, make a personal and sworn renunciation of any and all foreign citizenship

    before any public officer authorized to administer an oath" aside from the oath of

    allegiance prescribed in Section 3 of R.A. No. 9225. The twin requirements of swearing to

    an Oath of Allegiance and executing a Renunciation of Foreign Citizenship served as the

    bases for our recent rulings inJacot v. Dal and COMELEC, Velasco v. COMELEC, and

    Japzon v. COMELEC, all of which involve natural-born Filipinos who later became

    naturalized citizens of another country and thereafter ran for elective office in the

    Philippines. In the present case, Tambunting, a natural-born Filipino, did not subsequently

    become a naturalized citizen of another country. Hence, the twin requirements in R.A.

    No. 9225 do not apply to him.