In practice, he has the authority to do anything he wants. Who is going to stop him? You? His pets in Congress? JPow's private hit squad? Clarence Thomas?

The first rule of neo-America is that you're playing the Chairman's Game[1], and there are no more rules. Its counterparties should bargain with it accordingly.

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[1] https://en.wikipedia.org/wiki/Mao_(card_game) [2]

[2] The Chairman's Game is a game invented in a university. Some say it was invented at Stanford, while others say it was invented at MIT. It was inspired by a formerly prominent, but now somewhat disgraced Chinese politician that was famous for coming up with a lot of interesting new rules for his subjects to follow, and enforcing those rules very harshly, without necessarily informing those subjects what those rules were. It's a little bit like Uno, a little bit like Crazy Eights, and the only thing that I can tell you about it is that there are times, when playing this game, when it is not a good idea to speak.