now to my special report tonight. bob mueller will eventually finish his investigation, potentially as soon as next month, and mueller's boss, rod rosenstein, signaling he'll leave the doj soon once mueller is done. but the final decisions about mueller's work will soon be in someone else's hands. not mueller. not rosenstein. so even as president trump rages about his wall and these battles over the shutdown, keep your eye on what else trump is doing that he's not tweeting about tonight. he's trying to put the future of the mueller probe in the hands of william barr. next week, even as this shutdown may certainly grind on, these mueller questions will come to a head. at a senate confirmation hearing for barr. when a new attorney general is appointed during a criminal probe involving the president, it tests our system. the founders knew that. our constitution is built to hold politicians accountable. not let them cancel out the rule of law or separation of powers just because the heat is on. and that is why next week's