Meh, he's been against Trump and Trumpismo from the start. There are some johnny-come-latelys out there, and one really has to wonder why anyone in his right mind would generally support Trump now. Can't really ask Republicans because they are afraid of those who aren't in their right minds.
I think Trump is going to be curbed one way or the other. What's worrying is that ing Tom Cotton who really wants to be an authoritarian president out of principle and not convenience like Trump. I'm sure he's not the only one.