Probably, Sessions is afraid of the Deep State coming after him with some trumped up charge of obstruction. He probably likes the safety of being on the other side. And he probably rationalizes it all by thinking that he's following the rules, never mind that the rules are dictated to him by the DOJ's Deep State lawyers.
It really doesn't take much for Session to be afraid.
Sessions is simply a coward.
“Sessions is simply a coward.“
I can go with that.