McCain was born in the Panama Canal Zone. Had he been elected, he would have become the first president who was born outside the contiguous forty-eight states. This raised a potential legal issue, since the United States Constitution requires the president to be a natural-born citizen of the United States. A bipartisan legal review, and a unanimous but non-binding Senate resolution, both concluded that he was a natural-born citizen. If inaugurated in 2009 at the age of 72 years and 144 days, he would have been the oldest person to become president.