I mean.... He's already destroyed what reputation and goodwill the country had with most friendly nations, and that won't be likely to ever recover. Certainly not for many decades. The country itself is in quite a bit of internal turmoil.
He is unlikely to destroy the world, but plenty of insane Nationalist Christians believe the end is close and want to bring about global war so a carpenter who died a couple thousand years ago can come out of the celestial closet he's been hiding in. So while unlikely, he's got people trying to make it happen.
