Few details about the disarmament agreement were initially released and there was no immediate word from Israeli officials or Hamas on the president's announcement.
President Trump said his focus now is on rebuilding Gaza, but has shared few specifics on his vision for security and governance of the enclave.
"Thank God that everyone is home right now. All the living hostages are home."
U.S. President Donald Trump expressed concern in a social media post that too few of the dead hostages have been returned.
All 20 living hostages held by Hamas and hundreds of Palestinian prisoners held by Israel walked free Monday as part of a ceasefire pausing two years of war that decimated the Gaza Strip and killed tens of thousands of Palestinians.
Responding to a question about reports of Hamas rearming themselves, Trump said that "we gave them approval for a period of time."