Some quick Barr facts.
He's been attorney general before – under President George H. W. Bush. And in that position, he once oversaw Robert Mueller, the current special counsel, when he headed up the Justice Department's Criminal Division.
Barr served as Attorney General under President George H.W. Bush for two years, after previously working in both the Department of Justice’s Office of Legal Counsel and as Deputy Attorney General. He sailed through the Senate confirmation process in November 1991, receiving unanimous approval via a Senate voice vote.
Sauce >https://abcnews.go.com/Politics/william-barr-trumps-attorney-general/story?id=59661840