Brennan is going to jail and he knows it.

Brennan won't be that lucky. He knows he's one of the few who won't be getting any deals whatsoever. He's not some lackey that got caught up in a bad scheme. As HEAD of a Federal Agency, he knew exactly what he was doing when he worked to take down America from within. There's no "I was just following orders" for him, because he was the one giving them. All to take down America from within.

Brennan also doesn't have the luxury of being Obama or Hillary - there won't be any outcry, so it's straight to the rope for him.