Sessions only failure was taking a appointment and then acting like a politician... which was the root of his problems. I have no issues with him back in the Senate... and he’s a shoe in if he runs.
The problem with Sessions is that he is a coward. He recused himself and he let the Deep State inside the DOJ and FBI do as they please.
I wouldn't trust Sessions as senator. He already has served notice that he would hurt Trump. He'll do it again.