Ideally, Mr. Barr will share Mr. Mueller’s report with the country. But if he elects to withhold it, President Trump will no doubt claim victory. He will no doubt treat the absence of an indictment as full vindication. But here’s a truth for the president: He was never going to be indicted. The Department of Justice has a longstanding policy against indicting a sitting president, and the absence of an indictment does not mean no evidence of conspiracy or obstruction was found.

Indeed, Mr. Mueller’s report may not be the end of the president’s legal peril, only the beginning. That’s because report or no report, through his prosecutions, referrals, indictments, convictions and subpoenas, Mr. Mueller has already provided the House of Representative with some very clear paths for investigation.

So even if the Mueller report simply gets tossed in a drawer in Mr. Barr’s desk for all eternity, there is already sufficient material out there to let the House exercise its newly rediscovered oversight responsibilities and get to the bottom of what happened between the Trump campaign and Russia during the 2016 election.