David Gergen: “There's a very real danger that Sessions will be out and Trump is going to fire Mueller or put somebody in to close down…”

President of United States has not had a security briefing, or security briefing since October 2nd. I've never heard of any president, under any circumstances, come anywhere close to that, and been so derelict of the duty.

If he had a receptive audience, and I will tell you, when everything -- when all the facts were to come out, it would be like Nixon and the tapes.

It's increasingly hard to govern.

It's very, very big. Not legally, but politically, it's a very, very big deal.