Guys like Comey and Brennan know they are in legal jeopardy. That is the reason they are being so over the top in publicly attacking POTUS, IMO. Now if they are indicted they will scream that it’s politically driven prosecution from the Trump admin.
Unless Brennan’s attorney is an utter fool, along the lines of an Avenatti, Brennan should be keeping his big yap shut at this point.