It's not hyperbole, this is directly from Congressional Republicans. They believe that "executive immunity" means the President can commit whatever crimes he wants in office, and is immune from prosecution until his term is over.

They actually brought that hyperbole up to one of the supporters and they asked "well, so what did that person do that he would shoot them?"

In the absurd hypothetical that the President decided to shoot someone, that's a relatively reasonable question one might ask...