McCain was born in 1936 in the Panama Canal Zone while his father was stationed there as a naval officer. In 1787, however, the framers insisted that any president be natural born — that is, born within the United States. … absent a constitutional amendment, the question remains whether McCain can claim natural-born status. [Source, JONATHAN TURLEY, Legislation Introduced to Remove McCain’s Panama Problem in Seeking Presidency]

See also The New York Times. It took an act of Congress to make John McCain a natural born citizen. See 110th CONGRESS 2d Session S. RES. 511 agreed on April 10, 2008.