There absolutely is. Also this norm (you know don't incite an armed mob in to attack the other branch of government) needs to be enforced or it will happen again
Doesn't rely on the cabinet to do the right thing.
And this wouldn't? It would almost certainly require a veto override and probably overcoming a filibuster
Noted radical left-wing paper, USA Today, will run a full page opinion calling on Pence and the cabinet to use the 25th amendment and remove trump from power