Mr. McCain is not the first person to find himself in these cir stances. The last Arizona Republican to be a presidential nominee, Barry Goldwater, faced the issue. He was born in the Arizona territory in 1909, three years before it became a state. But Goldwater did not win, and the view at the time was that since he was born in a continental territory that later became a state, he probably met the standard.
It also surfaced in the 1968 candidacy of George Romney, who was born in Mexico, but again was not tested. The former Connecticut politician Lowell P. Weicker Jr., born in Paris, sought a legal analysis when considering the presidency, an aide said, and was assured he was eligible. Franklin D. Roosevelt Jr. was once viewed as a potential successor to his father, but was seen by some as ineligible since he had been born on Campobello Island in Canada. The 21st president, Chester A. Arthur, whose birthplace is Vermont, was rumored to have actually been born in Canada, prompting some to question his eligibility.
Quickly recognizing confusion over the evolving nature of citizenship, the First Congress in 1790 passed a measure that did define children of citizens “born beyond the sea, or out of the limits of the United States to be natural born.” But that law is still seen as potentially uncons utional and was overtaken by subsequent legislation that omitted the “natural-born” phrase.
Mr. McCain’s citizenship was established by statutes covering the offspring of Americans abroad and laws specific to the Canal Zone as Congress realized that Americans would be living and working in the area for extended periods. But whether he qualifies as natural-born has been a topic of Internet buzz for months, with some declaring him ineligible while others assert that he meets all the basic cons utional qualifications — a natural-born citizen at least 35 years of age with 14 years of residence.
“I don’t think he has any problem whatsoever,” said Mr. Nickles, a McCain supporter. “But I wouldn’t be a bit surprised if somebody is going to try to make an issue out of it. If it goes to court, I think he will win.”
Lawyers who have examined the topic say there is not just confusion about the provision itself, but uncertainty about who would have the legal standing to challenge a candidate on such grounds, what form a challenge could take and whether it would have to wait until after the election or could be made at any time.
In a paper written 20 years ago for the Yale Law Journal on the natural-born enigma, Jill Pryor, now a lawyer in Atlanta, said that any legal challenge to a presidential candidate born outside national boundaries would be “unpredictable and unsatisfactory.”
“If I were on the Supreme Court, I would decide for John McCain,” Ms. Pryor said in a recent interview. “But it is certainly not a frivolous issue.”