My bet is on Gavin sacrificing his position as governor of CA to save the nation from the evil orange man.
That could happen. The rat base will have no problem with a switch. Complying with your own rules and process is for the chumps on the right.
His ex-wife standing on the dais with the heir apparent to the Alpha male would have to have psych value.
President Trump in a debate could make an innocuous feint near Gavin and the world could see him flinch and cower.