Robert Mueller, widely respected despite being a lifelong Republican and former Director of the FBI, was appointed by Trump’s Deputy Attorney General Rod Rosenstein in 2017 to investigate foreign interference in the 2016 election and obstruction of justice. He found it.

Over nearly two years, the investigation examined a broad campaign by Russia to influence the election, including the hacking and release of Democratic emails connected to his opponent, Hillary Clinton, and a social media operation aimed at American voters. It also scrutinized contacts between Russian individuals and Mr. Trump’s campaign advisers, as well as actions taken by the president after he took office.

The inquiry resulted in charges against more than 30 people and three companies on more than 100 criminal counts.

Several of Mr. Trump’s associates and others in their circles were charged and eventually pleaded guilty or were convicted, including the president’s former campaign chairman, Paul Manafort. Twenty-five others were Russians accused of interfering in the presidential election.

Trump simultaneously claimed that Mueller conducted a witch hunt and exonerated him. Both claims were absurdly false.

Mr. Mueller submitted his report in March 2019. It concluded that Russia had carried out a sweeping and systematic effort to interfere in the election, and that the Trump campaign expected it would benefit electorally from those efforts. The investigation did not establish that members of the campaign had conspired or coordinated with the Russian government in its election interference activities, the Justice Department concluded.

What Mueller did not do, and what Attorney General Bill Barr did not do in the time following Mueller’s report, was prosecute a sitting president for a crime stemming from his ambivalent findings. Trump has since proclaimed in his odd mocking way that it was the “RUSSIA, RUSSIA, RUSSIA” hoax, because if he said it enough times, fools would believe it. It was no hoax. Or as Don Junior said, “I love it.”

Robert Mueller died from Parkinson’s Disease. President Donald Trump had something to say about it.

Given Trump’s inclination to hate anyone who doesn’t openly and constantly express their adoration of him, filling the void shared by narcissists, it’s hardly surprising that Trump hated Mueller. Given that Trump has never shown the capacity to be graceful, either in the way of a gentleman or in the way of a Christian, as reflected in his reaction to the death of Rob Reiner, it came as no surprise that Trump couldn’t manage to control his impulse to lash out at his enemy, even in death. It was a curious juxtaposition to Trump’s reaction to the death of his one-time best friend, Jeffrey Epstein, about whom he had no unpleasant words upon his death.

But to put into writing, “Good, I’m glad he’s dead,” is below vile, even for Trump. Some might chalk it up to the disinhibition that comes with the onset of dementia, the impulsivity that causes the elderly to say things without the filter of either good judgment or, at a minimum, good taste. It would be bad enough that Trump hated Mueller for doing the job he was tasked by Rosenstein, but Trump never grasped that others, unlike himself, were constrained by truth and integrity, two things that have no place in Trump’s head.

It’s far worse, however, that a sitting president, a person who has taken a nation to war without authority, approval or, indeed, any plan beyond the fantasy win in his fevered imagination, has neither the impulse control nor good sense not to say such things, even if that’s the way he feels in his bones. It’s as offensive and awful as “joking” with the Japanese Prime Minister that they know about surprise attacks since Pearl Harbor.

No doubt the MAGA faithful hate Mueller just as much as Trump for having failed to proclaim their Fearless Leader as the greatest living president ever, and will accordingly manufacture excuses for Trump’s impetuous words as being merely Trump being authentic. Yet, for anyone not down that rabbit hole, We are a nation at risk at the whim of a person who is so lacking in self-control that he would write such a thing about Robert Mueller.