By now, few might lift an eyebrow at President Trump’s crusade to delegitimize his own Justice Department and, specifically, his attorney general, Jeff Sessions. It long ago became clear that Mr. Trump regards federal law enforcement — as he sees all of government — as a political tool to advance the interests of himself and of his party (assuming those interests align, of course; if not, the party is on its own).

Yet even by that debased standard, Mr. Trump’s latest Twitter tantrum against Mr. Sessions, on Monday, set a new low, providing a kind of anti-civics lesson for the nation he’s supposed to lead.

“Two long-running, Obama era, investigations of two very popular Republican Congressmen were brought to a well publicized charge, just ahead of the Mid-terms, by the Jeff Sessions Justice Department,” he wrote. “Two easy wins now in doubt because there is not enough time. Good job Jeff.”

With this latest outburst, the president has again laid bare his contempt for the rule of law. Mr. Trump does not even pretend to care about the allegations of corruption against the two lawmakers in question. His concern is only that they are “very popular” members who would have scored “easy wins” in November, if only Mr. Sessions had kept his fat mouth shut until after the midterms — or better yet, buried the allegations permanently.