The idea of "Biden Derangement Syndrome" never really gained traction, but Trump seems to have a virulent and untreated case of it.

Take his Easter message, for example

Indifferent to the point of the holiday, the Republican president whined about “Radical Left Lunatics,” “WEAK and INEFFECTIVE Judges,” and his 2020 election defeat, before turning his attention to his principal target.

Sleepy Joe Biden purposefully allowed Millions of CRIMINALS to enter our Country, totally unvetted and unchecked, through an Open Borders Policy that will go down in history as the single most calamitous act ever perpetrated upon America. He was, by far, our WORST and most Incompetent President, a man who had absolutely no idea what he was doing.

.....But it’s not altogether true to say that Trump sees literally everything through a self-centric lens. There are plenty of other things he also sees through a Biden-centric lens.

The idea of “Biden Derangement Syndrome” never really caught on as a phenomenon during Biden’s term, but to the extent that the ailment exists, there’s reason to believe his successor has contracted a virulent strain, which has gone completely untreated.

Consider last week, for example.

Asked about Russia’s war in Ukraine, Trump responded by talking about Biden. Asked about trade tariffs, Trump responded by talking about Biden. During a late-night exchange aboard Air Force One, a reporter noted the late hour and Trump responded by talking about how Biden would be asleep. Soon after, while talking about his recent cognitive exam, he claimed that the first question he asked his physician was whether Biden took the same test.......

When the Signal chat scandal broke, Trump talked about Biden. When NASA astronauts Suni Williams and Butch Wilmore finally returned to Earth, Trump talked about Biden. When lawmakers prepared to approve a budget resolution, Trump talked about Biden. When American hostages returned to the United States, Trump talked about Biden. When he delivered a national address to a joint session of Congress, Trump referenced Biden 16 times.

An analysis conducted by The New York Times found that during the first 50 days of Trump’s second term, he mentioned the name “Biden” an average of 6.32 times per day. The Times’ report added, “It is among his most frequently used terms (he said ‘Biden’ in more speeches than he had said ‘America,’ for example).”

The Washington Post had a similar report a couple of weeks after Inauguration Day, noting, “He brought him up just after he was inaugurated. He ridiculed him while touring disaster sites in North Carolina, laughed about him in Las Vegas and pilloried him while delivering a virtual address to business leaders gathered at the World Economic Forum in Davos, Switzerland. Joe Biden’s presidency ended two weeks ago. His photos no longer hang on the walls. His artwork choices in the Oval Office are gone. But inside the head of President Donald Trump, he is still very much top of mind.”.....

But I tend to think the explanation is more straightforward than that. Notwithstanding his forgotten Reform Party bid a quarter-century ago, Trump has run three national campaigns, and he won two of them. The third he lost, by a healthy margin, to Biden.

And by all appearances, he’s still not over it.