1a. How: The law. Literally Trump “can’t” just say “I’m going to run again”. The constitution forbids it. Now I’m not saying that will stop all the states from putting him on the ballot, but it will stop many, and that’s enough to get any sane Republican screaming for an alternative. 1b. Why: The law. Republicans know perfectly well Trump is a shit-show, but they lacked the courage to say no to a 2nd term. A third term puts them into not-needing-a-spine-to-say-no territory. Many desperately want to get rid of him and that is their safe opportunity. 2. Of course I do. I also remember the attempted coup failed miserably. And anyway that is quite different from running in the primary.