Here’s the working link, to one of the reasons, Leo Donofrio is saying that Obama AND McCain, are both ineligible for the Presidency...
US Department of State
Foreign Affairs Manual
http://www.state.gov/m/a/dir/regs/fam/
Section 7-1116.1-4C
Correction:
Section 7-1116.1-4C, is the reason why Donofrio is saying MCCAIN is ineligible for the Presidency.