As long as Jeff Sessions remains as the AG, no politician or beaurocrat will ever be prosecuted for anything (unless they smoke a joint).
Not only is Sessions not interested in controlling what is supposed to be 'his staff', not only is he completely uninterested in the daily revelations of massive corruption that occurred in the Obama administration, not only is he not interested in Comey and his crew actively illegally leaking classified information and conspiring to thwart Trump, more than being uninterested he actually hides from these glaring issues.
Not only does he not lift a single finger to do something, he refuses even to discuss it. Libby, Hillary, Holder, Lynch, Learner, and all the rest have nothing to fear as long as Sessions remains in office. He will surely ignore/protect them for as long as he can.