A. You can't hire people who don't want the job. I think now we understand why a person already in a succesful career wouldn't want to give that up to face the arrows that would come their way.
B. Basically Mitch told Trump that anyone not on his approved list would be DOA in the Senate.
Mitch and the U.S. Senate were integral over the past four years in turning this country into a fascist government.