I think the character does tend to suit an episodic thing, because what's fun about him is that he doesn't care about anyone else, and it's very difficult for a main character - a lead character - in a movie to not care about anybody else. ↗
In fact, I really didn't get enthused about his Secretary of State race until I attended a couple of his rallies and found out there were a bunch of young folks that there were a bunch of young folks that he had been able to recruit on his own. ↗
I sometimes find that playing the bad guy, or villains, or psychopaths tend to be much more psychologically rewarding. And you can really push it, you can push the limits, and get away with it. ↗