This is Fitzpatrick all over again.  On day one, Fitz knew who leaked Valerie Plame's name.  It was an accident and Fitz, rightly, did nothing.  But, he hung around for 2 years trying to get somebody and finally got Libby for not remembering what someone else did.    No prosecution should get an unlimited budget to hire partisan lawyers to poke around to find something.  Since it is clear, there is no connections between Trump and Russians, then Mueller's task is done.   He needs to go and to not continue to leach off the government.