No. You'd have to catch him in some illegality, etc., to make him resign. Sasse might be smart enough to stay clean.
Figure out how to dry up some of the money and primary him.
LOL - is that the Q solution?
The point is - Sasse, and the Political Left, are convinced that the Republican Party will never fight back, no matter how grave the insult or the betrayal.
So far, Sasse and the Political Left are absolutely correct.