Dude,

I've seen the copy of his (U.S.) birth certificate! Of course he's a citizen! If he has a U.S. birth certificate, unless he's renounced his citizenship (which is both extremely difficult and extremely unlikely), he's a citizen.

By the way, I can file a lawsuit against George W. Bush, claiming he's actually a chimpanzee and thus ineligible to be president if I want to. But the filing of a lawsuit doesn't make it so.