Earlier this month, the president said he favored taking control of Gaza and displacing the Palestinian population of the devastated seaside enclave. Over the course of several days, he repeatedly waved aside objections to the idea, including flat-out rejections from the leaders of Egypt and Jordan.

At the time, Mr. Trump said that he would be able to persuade the leaders of those two countries — and potentially others in the region — to accept the Palestinians through the force of his will.

“They say they’re not going to accept,” Mr. Trump said. “I say they will.”

But in a telephone interview with a Fox News host on Friday, Mr. Trump seemed to concede that his efforts at persuasion had failed and the refusal by Egypt and Jordan to accept displaced Gazans would make the idea unworkable.