Just discussed this with David Limbaugh, Rush’s brother & a lawyer. I asked what kind of timeline it would take to bring casa against Lynch, Comey, Cankles, esp if it had to be done very secretly. He said quite a while.
Sessions seems like the kind of guy who would feel constrained by his confirmation hearing testimony, where he told the Senate judiciary committee that he would recuse himself from any investigation involving Hillary’s email server or the Clinton foundation. He said he felt his campaign statements about these things would compromise the appearance of objectivity. I suppose he could change his mind about it, but he seems less likely to do that than the President.