Remember when Gonna Graham said that he was going to "get to the bottom" of something or other. And was even going to call witnesses. I'll give a short thread from questioning of SSA1 (Pientka) to give you a flavor of the abject uselessness and failure of Gonna's process.
2/ On hand to ensure that Pientka didn't answer questions were eight (!) lawyers: three for Pientka personally, three from FBI and two from DOJ.
3/ when Committee counsel inquired about predication of Flynn investigation, Pientka lawyer directed him not to answer, so he didn't. Committee lawyer didn't object or inquire as to basis of refusal.