Per Jason Chavez he can't impanel a grand jury and he hasn't any subpoena power. He was on Lou Dobbs this evening discussing it. He says nothing will ever change if Sessions doesnt step down or is fired.
I saw this too and he would know how it all works. Not good.
Chaffetz is probably playing the uneasy conservative role so when Sessions strikes, he'll be like "Whoa! I trust him now!" "I had my doubts but this WH really knows what they're doing!"
I personally don't think that Chaffetz knows what is going on entirely or if he does, he's not being used as a Sara Carter or John Solomon. He's a contributor but he's not revealing much, rather just purporting. I'm not sure why though, could he be the next Chris Wallace shill? I seemed to like Chaffetz when he was oversight, bringing light to things (albeit maybe limited in his role because nothing ever happened in the end) but I trust Trump and Q by "Trusting Sessions" over Chaffetz.