You know, this might actually be really bad politics.
Trump is not the only person at the top. He's kind of a lame duck, actually: he just does whatever Miller says. The only time he steps in is when he's personally insulted by something because he desperately wants everyone to know he's a very special boy.
I do take issue with democrats blaming everything the republicans are up to on Trump specifically, as if the party might return to normal once he dies.