My whole thoughts on this is simple: Ask him to congress again and simply ask the same questions. I'm not sure exactly how this works but Fauci's pardon makes him compelled to not use the 5th, but if you simply ask him the same questions, I don't think Fauci will tell the truth again. He'll be stuck either lying again, and being prosecutable, or he'll have to publicly tell the truth. It's a perfect win-win.