Donofrio is defining it as a person born in the U.S. of two parents who are U.S. citizens. His definition is at odd with U.S. law - McCain is a natural born citizen on the basis of his parents being U.S. citizens who had resided in the states for some years prior to his birth. But if the Supreme Court takes up the Donofrio case and rules for the plaintiff then both McCain and Obama are disqualified.
As well as Calero