After what we all witnessed in his recent "testimony", what on earth makes you think he is willing to help with that in any way, shape or form?
He is not willing. Neither is Rosenstein. They are being manipulated by Trump and, yes, Sessions. The more these guys stall and lie the more becomes publicly known. The Deep State cannot be cleaned out if you just peremptorily lop off the bad twigs at the ends of the branches.