The consensus before the 2008 election campaign was that to be “natural born” you had to have two citizen parents and be born within the borders of the Republic. In order to get the birthers off Obma’s neck the Congress passed a resolution declaring both Obama and McCain to be eligible for election to the presidency.
Congress did it for McCain only. S.Res.511 - A resolution recognizing that John Sidney McCain, III, is a natural born citizen. Unless you have a link...
A resolution isn't binding, meaning it isn't a law.