President Trump on Tuesday night shared an AI-generated video depicting the devastated Gaza Strip as an opulent resort emblazoned with his name, less than a week after he appeared to back off his proposal to displace Palestinians en masse from the territory and assert U.S. control over it.

It was not immediately clear where the video originated or who made it, and Mr. Trump did not add any comment to the social media post that shared it. Versions of the video had appeared on social media sites including LinkedIn, X and Instagram in recent weeks. The video shared on Mr. Trump’s account appeared to have been downloaded from Rumble, a Florida-based video platform popular on the right.

The video was immediately scorned by many Palestinians, much as Arab nations rejected Mr. Trump’s plan when he announced it early this month.

“It’s a fantasy,” said Ahmed al-Soufi, the mayor of Rafah, a city in southern Gaza where huge numbers of displaced people live in tents amid rubble. “If Mr. Trump wants to give Palestinians a place to live in dignity and a future, he must give them a state alongside Israel.”

The video begins with scenes of people, including gunmen, walking through the ruins of heavily damaged streets, then quickly transitions to images of development and then beachside luxury. Scenes variously show a child holding a balloon shaped like Mr. Trump’s head; a large golden statue of the president; and a man throwing money in the air on a beach.

Some signs of AI-generated imagery are more subtle than others. One scene shows a man who resembles the billionaire Elon Musk, a close adviser to the president, eating bread with six fingers on one hand. Other scenes show belly dancers with beards and green head scarves on a beach; Mr. Trump dancing with a woman at a nightclub; and Mr. Trump and Prime Minister Benjamin Netanyahu of Israel sitting shirtless at a pool with drinks.