Doesn't Barr realize that Mueller will refute all the lies he's saying now? Or maybe he knows that Mueller won't get a chance to testify, and also knows Mueller won't break protocol while still involved with other cases with the DOJ. Playing devil's advocate here, but I think the DOJ will keep Mueller busy on purpose, so that he can't quit and testify as a private citizen. If anyone can correct me if I'm wrong, please do. I like to learn from my mistakes;p