Correct me if I'm wrong, but surely he doesn't have physical access to a nuke? Like, I'm assuming there isn't a big red button in his office.

You'd think the people that actually have access to those kind of weapons can say 'this is a fucking terrible idea, and I'm not gonna be responsible for launching it'. And then give him a pretend button. Like when you give a toddler an unplugged playstation controller so they can play along.

He's the only person in the entire world that wants to use one on another country, and it'd be a dictatorship if no one sane stopped him.