Can Trump Protect Himself?

Martin Longman has an unusually optimistic take on how Trump may be hemmed in from firing Mueller or even replacing Rosenstein with a sycophant.  Perhaps this is why Trump has been constrained from doing so.  Ideally, we would get actual pre-emptive legislation from the Congress with margins large enough to override any veto.  Absent that, Trump will rely on an increasingly batshit insane group of advisors, including his main source of advice: Fox and Friends.