While a coup is possible, as are rogue military using their weapons without authorization (from what I've heard, the "football" isn't necessary to use some of them), that doesn't mean he won't be stupid enough to try a round of Kumbaya, first. I believe that he'd try to argue that the use of atomic weapons against any enemy is a war crime that he can't engage in. In fact, the way he's been going, I'm starting to believe he's the sort of leftist who would sacrifice his country for that sort of nonsense. And like I said, I hope his enemies don't start believing it or this could be a real short ride to worst president in American history.
After all, his name is Hussein.