If POTUS, Trumo vetoes this lunatic budget bill...he will politically destroy Ryan, McConnell, Schumer & Pelosi in one fell swoop!!! We shall soon see, what the POTUS chooses to do.
You could be right, or maybe not. My point is Trump cannot fire leaders in Congress; they do not work for him or under him.
A serious suggestion would be that if Trump vetoes the Omnibus spending bill Ryan and McConnell should resign. That would not be silly. Saying Trump should fire them is just silly.