The testimony on the firing of US Attorneys can't be under oath, it can't be recorded, and there is no follow-up testimony allowed. Congress also gives up it's right for further subpoenas.
I ask one question of Fred Fielding, Counsel to the President, who do you think you are talking to, a Republican Congress that will let you get away with this crap?
Fred, you now have to play by big boy rules. You testify under oath and in public. You are doing the people's business now. Get used to it.
Here is the letter from Fielding