Yes, Ted Cruz is Constitutionally Eligible to Be President

Legal scholars are firm about Cruz’s eligibility. “Of course he’s eligible,” Harvard law professor Alan Dershowitz tells National Review Online. “He’s a natural-born, not a naturalized, citizen.” Eugene Volokh, a professor at the UCLA School of Law and longtime friend of Cruz, agrees, saying the senator was “a citizen at birth, and thus a natural-born citizen — as opposed to a naturalized citizen, which I understand to mean someone who becomes a citizen after birth.” Federal law extends citizenship beyond those granted it by the 14th Amendment: It confers the privilege on all those born outside of the United States whose parents are both citizens, provided one of them has been “physically present” in the United States for any period of time, as well as all those born outside of the United States to at least one citizen parent who, after the age of 14, has resided in the United States for at least five years. Cruz’s mother, who was born and raised in Delaware, meets the latter requirement, so Cruz himself is undoubtedly an American citizen.

No court has ruled what makes a “natural-born citizen,” but there appears to be a consensus that the term refers to those who gain American citizenship by birth rather than by naturalization — again, including Texas’s junior senator. Cruz, a constitutional lawyer, is unequivocal on the question. His press secretary, Catherine Frazier, tells National Review Online that, while a 2016 run is far from his mind right now — he’s “fully focused on his role representing Texans in the U.S. Senate” — there should be no confusion about his presidential eligibility. “He is a U.S. citizen by birth, having been born in Calgary to an American-born mother,” Frazier says.  

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The Cruz questioners adhere to a slightly different strain of birtherism than Obama's critics, who have questioned the authenticity of his Hawaiian birth.  Whereas the Obama doubters allege a full-blown conspiracy to hide the president's true origins, the Cruz crew is quarreling over an interpretation of the law.  Sen. Marco Rubio has also drawn birthers' attention, but for a third reason.  This group concedes that Rubio was born on US soil in Miami to Cuban parents, but asserts that "anchor babies" shouldn't be considered natural born citizens under the 14th Amendment.  This is also a legally dubious interpretation, to put it charitably.  To recap, the birthers have latched on to three separate forms of eligibility skepticism:  (1) A politician is lying about being born in America, (2) a politician was born in another country, which precludes him from claiming "natural born" status, and (3) a politician was born in America, but his parents weren't citizens at the time.  The Congressional Research Service offers a succinct explanation of how the "natural born" clause should be applied:
 

The weight of legal and historical authority indicates that the term “natural born” citizen would mean a person who is entitled to U.S. citizenship “by birth” or “at birth,” either by being born “in” the United States and under its jurisdiction, even those born to alien parents; by being born abroad to U.S. citizen-parents; or by being 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.  

Byron York delved deeper into the eligibility laws last year:
 

First, there are people born inside the United States. No question about that; their citizenship is established by the 14th Amendment. Then there are the people who are born outside the United States to parents who are both American citizens, provided one of them has lived in the U.S. for any period of time. And then there are the people who are born outside the United States to one parent who is a U.S. citizen and the other who is an alien, provided the citizen parent lived in the United States or its possessions for at least five years, at least two of them after age 14...The law is really quite lenient, especially for those born outside the United States. If a child were born today in, say, Kenya, to a Kenyan father and an American citizen mother who had lived in the United States for at least five years, at least two of them over the age of 14 -- that child would be a "citizen of the United States by birth" and be eligible for the White House. What about a child born in the United States to noncitizen parents? "I am not aware of anyone who has contended that someone could be born in the United States and be a citizen by virtue of the 14th Amendment and nevertheless still not be a natural-born American citizen," says Washington lawyer Matthew McGill, who worked with Olson on the McCain case and did extensive research into the law and history of citizenship. "If he is born in the United States, his parentage is not of consequence."  

Two other prominent Republicans have attracted birther scrutiny: Louisiana Governor Bobby Jindal, who was born in Baton Rouge to Indian immigrants, and Mitt Romney, a native of Michigan.  Romney's father, who ran for president in in 1968, was born to American parents in Mexico.  I'll leave you with a tip of the hat to the Huffington Post for coining the term, "equal opportunity annoyers" to describe the (marginal) birther movement.  Perfect.