While I respect the erudition of Dershowitz, he isn't our white knight. Certain people who should have been supporting their President but have been discreetly playing both ends against the middle are going to have to declare themselves, one way or the other. For those of us who have been wondering just how far Mueller would go to force a firing, it's at least this far and likely to be further.
Trump can take this to the Supremes. If the Deep State still has Roberts' ovaries in a vise, and they rule against the President, guess what?
You have a VERY pissed-off the Donald, as Commander in Chief, with all of his Deplorables too, and he now has the ability to violate ANY attorney-client privilege to go after the Deep State: literally to the point of extinction. :-)