Sessions needs to appoint a by-the-law special counsel to investigate Hellary and the Dems for their known crimes. He can then step back from it.
Why waste your time with a case that will bring no result. She'll never go to jail. She'll never even be chastised except for Trump's tweets...which are indeed a good thing.
But a case that goes no where is worthless AT THIS POINT IN TIME. Maybe next year.