And third, the special counsel has referred numerous cases to other law enforcement authorities — including at least one involving alleged misconduct by the president regarding campaign contributions.

The Roger Stone chapter may seem like a sideshow, but it raises the question of how much advance knowledge the Trump campaign had of WikiLeaks’ release of Democratic emails hacked by Russians, and how Trump associates used that information in their campaign strategy.

Elements of this saga are part of the public record. Mr. Trump’s former attorney Michael Cohen stated in sworn congressional testimony that in July 2016, he heard Mr. Stone inform Mr. Trump that he had spoken with Julian Assange, the founder of WikiLeaks, and that Mr. Assange planned to release emails that would “damage Hillary Clinton’s campaign.” And according to the Mueller report, Rick Gates, the deputy Trump campaign head, said that by the late summer of 2016 the campaign was planning “a press strategy, a communications campaign, and messaging based on the possible release of Clinton emails by WikiLeaks.” Mr. Mueller confirmed in testimony yesterday that the campaign devised its strategy around documents stolen by Russia and covered this up.

However, the public is still in the dark about much involving the WikiLeaks releases, and specifically how much Mr. Trump knew about or participated in the arrangement. For example, the Mueller report heavily redacts the text surrounding its references to conversations Mr. Trump had with Mr. Cohen, Mr. Gates and his campaign chairman, Paul Manafort, after the July 2016 WikiLeaks release — including the discussion Mr. Gates reported, in which he said Mr. Trump told him “more releases of damaging information would be coming.”

Congress needs to examine whether the extremely convenient coincidence of the leak of more emails on Oct. 7, 2016, just one hour after an “Access Hollywood” tape revealed Mr. Trump bragging about assaulting women, was in fact just that, a coincidence, or was instead another act of coordination by the Trump campaign or the candidate’s associates.