T he standing qualifications to be President of the United States are set out in the Constitution, at Article II, Section 1, clause 5, and state three specific requirements: one must be at leas t 35 years old, a resident "within the United States" for 14 years, and a "natural born Citizen." According to the Supreme Court, words and phrases used, but not defined, within the Constitution, should generally "be read in light of British common law," since the U.S. Constitution is "framed in the language of the English common law." As noted by the Supreme Court of the United States, this "same rule" was applicable in the colonies and "in the United States afterwards, and continued to prevail under the Constitution" with respect to "natural born" U.S. citizenship. Considering the history of the constitutional provision, the clause's apparent intent, the English common law expressly applicable in the American colonies and in all of the original states, the common use and meaning of the phrase "natural born" subject in England and the American colonies in the 1700s, and the subsequent action of the first Congress in enacting the Naturalization Act of 1790 (expressly defining the term "natural born citizen" to include those born abroad to U.S. citizens), it appears that the most logical inferences would indicate that the phrase "natural born Citizen" would mean a person who is entitled to U.S. citizenship "by birth" or "at birth." Such interpretation, as evidenced by over a century of American case law, would include as natural born citizens those born in the United States and subject to its jurisdiction regardless of the citizenship status of one's parents, and would also appear to include those born abroad of one or more parents who are U.S. citizens (as recognized by statute), as opposed to a person who is not a citizen by birth and is thus an "alien" required to go through the legal process of naturalization to become a U.S. citizen. The Supreme Court of the United States, in its landmark opinion on birthright citizenship authored by Justice Gray in United States v. Wong Kim Ark , citing both the common law and numerous legal precedents in the United States, explained in 1898 that a child born of alien parents within the country and subject to its jurisdiction (that is, whose parents are not diplomatic personnel representing a foreign nation or troops in hostile occupation) is considered a "natural born" citizen (in the United States) or subject (in England), as that term has been used over the centuries in England and the United States: 
It thus clearly appears that by the law of England for the last three centuries, beginning before the settlement of this country, and continuing to the present day, aliens, while residing in the dominions possessed by the Crown of England, were within the allegiance, the obedience, the faith or loyalty, the protection, the power, the jurisdiction, of the English Sovereign; and therefore every child born in England of alien parents was a natural born subject, unless the child of an ambassador or other diplomatic agent of a foreign State, or of an alien enemy in hostile occupation of the place where the child was born. That being said, however, one might argue that there existed what might be called a "common" or "general understanding," or at least common "usage" of the term "natural born," as it related to those who were considered "natural born" subjects of England in the American colonies at the time of independence, and "natural born" citizens at the time of the adoption of the Constitution. Citizenship at Birth: Case Law and Interpretations

The evidence of historical intent, general understandings, and common law principles underlying American jurisprudence thus indicate that the most reasonable interpretation of "natural born" citizens would include those who are considered U.S. citizens "at birth" or "by birth," either by the operation of the strict "common law" of jus soli derived from English common law (physically born in the United States and subject to its jurisdiction, without reference to parentage or lineage), or under existing federal statutory law incorporating long-standing concepts of jus s an guin i s , the law of descent, including those born abroad of U.S. citizen-parents. Legal Background and Historical Cases

Although the Supreme Court has not needed to rule specifically on the presidential eligibility clause, as discussed in more detail below, numerous federal cases, as well as state cases, for more than a century have used the term "natural born citizen" to describe a person born in this country and under its jurisdiction, even to parents who were aliens in the U.S. Additionally, several Supreme Court cases, as well as numerous constitutional scholars, have used the term "native born" citizen to indicate all of those children physically born in the country (and subject to its jurisdiction), without reference to parentage or lineage, and employed such term in reference to those citizens eligible to be President under the "natural born" citizenship clause, as opposed to "naturalized" citizens, who are not. There appears, however, to be no legitimate legal issue outstanding concerning the eligibility of all citizens of the United States who are born in the country to be President. To date, every court or administrative body dealing with ballot access issues has ruled against the challenges to the eligibility of President Obama.
The Constitution sets out three eligibility requirements to be President: one must be 35 years of age, a resident "within the United States" for 14 years, and a "natural born Citizen." There is no Supreme Court case which has ruled specifically on a challenge to one's eligibility to be President (although several cases have addressed the term "natural born" citizen), and this clause has been the subject of several legal and historical treatises over the years, as well as more recent litigation.
The term "natural born" citizen is not defined in the Constitution, and there is no discussion of the term evident in the notes of the Federal Convention of 1787. At the time of independence, and at the time of the framing of the Constitution, however, the term "natural born" with respect to citizenship was in use for many years in the American colonies, and then in the states, from British common law and legal usage. Under the common law principle of jus soli (law of the soil), persons born on English soil, even of two alien parents, were "natural born" subjects and, as noted by the Supreme Court, this "same rule" was applicable in the American colonies and "in the United States afterwards, and continued to prevail under the Constitution ..." with respect to citizens. In textual constitutional analysis, it is understood that terms used but not defined in the document must, as explained by the Supreme Court, "be read in light of British common law" since the Constitution is "framed in the language of the English common law."
In addition to historical and textual analysis, numerous holdings and references in federal (and state) cases for more than a century have clearly indicated that those born in the United States and subject to its jurisdiction (i.e., not born to foreign diplomats or occupying military forces), even to alien parents, are citizens "at birth" or "by birth," and are therefore "natural born"—as opposed to "naturalized"—U.S. citizens. There is no provision in the Constitution and no controlling American case law to support a contention that the citizenship of one's parents governs the eligibility of U.S. citizens born within the United States to be President.
Although the eligibility of U.S. born citizens has been settled law for more than a century, there have been legitimate legal issues raised concerning those born outside of the country to U.S. citizens. From historical material and case law, it appears that the common understanding of the term "natural born" in England and in the American colonies in the 1700s included both the strict common law meaning as born in the territory (jus soli), as well as the statutory laws adopted in England since at least 1350, which included children born abroad to British fathers (jus sanguinis, the law of descent). Legal scholars in the field of citizenship have asserted that this common understanding and legal meaning in England and in the American colonies was incorporated into the usage and intent of the term in the U.S. Constitution to include those who are citizens at birth.
Challenges in 2008 to the eligibility of both Senators John McCain and Barack Obama to be President, and "ballot access" challenges to President Obama in 2012, have prompted numerous court decisions which appear to have validated the traditional, historical, and legal meaning of the term "natural born" citizen as one who is entitled to U.S. citizenship "by birth" or "at birth." This would include those born "in" the United States and under its jurisdiction (i.e. "native" born), even those born to alien parents; those born abroad to U.S. citizen-parents; or those born in other situations meeting legal requirements for U.S. citizenship "at birth." Such term, however, would not include a person who was not a U.S. citizen by birth or at birth, and who was thus born an "alien" required to go through the legal process of "naturalization" to become a U.S. citizen.
This report has been updated from a previous version to include recent relevant judicial and administrative decisions, and will be updated as new decisional material may warrant.