If this were Nork land, I know of at least 50 administration types who would be out in the field holding artillery shells.
The President needs to act now. He is at a point of maximum political power. He should fire Rosenstein and make Pruitt acting Deputy AG. Or fire Sessions and make Pruitt acting AG. So what if the usual suspects whine. So what if they pass legislation purporting to protect Mueller. Trump can campaign in the fall against any Rep or Senator (those up for election) who vote to override his veto. Please just do it!