President Trump said he had spoken to Jordan’s leader and planned to call Egypt’s. Mr. Trump’s suggestion echoes proposals from far-right Israelis. A Hamas official rejected the idea.

The president, calling the heavily bombed enclave “a demolition site,” proposed relocating Palestinians temporarily or long-term, a move rejected by Arab countries since the war began.

Trump floated the idea on Saturday, saying he would urge the leaders of the two Arab countries to take in Gaza’s now largely homeless population, so that “we just clean out that whole thing.”