BRIAN KILMEADE (CO-HOST): I know there's no answer to this as of yet. Why did he do it? Why now, why yesterday, why did he say what he said, and why did he leave when he did? What is behind it? 

JASON CHAFFETZ (FOX NEWS CONTRIBUTOR): I mean, it's purely a guess, but from where I sit I think it was to cover his butt within his own political, social circles. I think that the Democrats were so disappointed that they didn't have what they had preached for two years that he had to come out there and try to say, and this is the core question -- you have Barr, Rosenstein and another person sitting in this room, and supposedly Mueller says look, I didn't prosecute and you know, here are the issues. But you have this discrepancy now as to whether or not he said, you know, was I held back because of the law? But I don't think he was. I think Barr was actually out there telling the truth, and it scared Mueller and his reputation. He was supposed to be the guy to get Trump, and he didn't, and he feels bad about that. But there was no evidence. He could never make a case.

Previously: 

How right-wing media defended Trump after Mueller's press conference

Sean Hannity: Robert Mueller “doesn't know the law; he's basically full of crap”

Laura Ingraham: Mueller was acting like a “mean girl” at presser

Tucker Carlson calls Robert Mueller “sleazy and dishonest”

Mueller’s statement was an indictment of the press