Will Trump’s obvious decline become a defining campaign issue?

The elephant in the room has been spotted:

Just before noon on a holiday weekend, while many Americans were at the beach, President Trump’s social media account roared to life. In what has increasingly become his weekend habit, he unleashed a daylong barrage of posts that put the bully in the modern bully pulpit.

There were images of Mr. Trump intimidating Canada’s prime minister with a hockey stick, personally bombing enemy targets and patrolling dark streets with killer robots. There were maps showing the United States taking over other countries, and maps renaming a state. There were attacks on the “Dumocratic Party” and tributes to himself as “the Greatest President of All Time!”

The 60 messages posted online over 10 hours and 41 minutes offered a window into Mr. Trump’s own unique reality, one anchored not in fact but in an expression of ego. For years, his social media feed was said to be a mirror of his id. But with A.I., it has become the manifestation of how he wants to be seen in a more visual, visceral way than ever before — as a warrior, as a conqueror, as a historical figure, as a younger and thinner and more muscular version of himself.

In Mr. Trump’s digitally enhanced version of the world, he is a giant in every way, a man who defeats every adversary, overcomes every obstacle and sinks every putt. He not only redraws the map of the world but vanquishes the heavens themselves. “The Moon Is Ours,” declared one post last weekend with an image of the earth’s only satellite. Another posted a few weeks ago showed him leading an extraterrestrial alien in shackles.

The rat-a-tat of ever wilder, ever more outrageous posts each weekend has become a fixture of the president’s second term, seen more and more as a barometer of his mental state. Mr. Trump’s critics, who never considered him a model of stability in the first place, now point to these frenetic bursts of fantasy and vanity as proof that the 80-year-old president is deteriorating further with age.

There will continue to be some good stories written about Trump’s increasing distance from reality. The question is whether this becomes a constant media narrative, or remains confined to individual stories that drift into the ether. We certainly know the political press is capable of the former when they want to.