He’s not the King.
after Trump we seem to have forgotten what powers a President does and does not have.
At the moment – and for a long time – the Supreme Court has the most power over the other branches, although they depend on other agencies to enforce things.
Usually they are careful about using it but this is an activist court and is doing activist changes to the USA, mostly based on the notions of the Federalist society; a project of theirs for many many many years coming to fruition.