Sorry guy, but he's 75 years old, he was born in America, and he's lived in America all of his life. There is no way you can spin him into being anything other than an American. Just because you don't like his politics doesn't change the facts.
Fact this I would like to shove his dentures down his throat. This is his nation if he loves Mexico enough to fly their goddamn flag he should haul his ass down there.
And what a charming individual you must be. Could you possibly try harder to make a fool of yourself?