The suggestion that Burr, a third-term senator not running for re-election, is failing to properly lead the committee escalates Republican complaints from the White House down who insist that Mueller's report closed the book on any question of whether Trump conspired with the Russians to meddle in the 2016 campaign or obstructed justice. Kentucky Sen. Rand Paul a day earlier tweeted that Burr apparently "didn't get the memo from the Majority Leader that this case was closed."