US President Donald Trump on Monday said the Hamas militant group had become difficult to deal with in recent days, but he was talking with Israeli Prime Minister Benjamin Netanyahu about"various plans" to free hostages still held in the enclave.

Trump also said the US would work with other countries to provide more humanitarian assistance to the people of Gaza, including food and sanitation.

"We're going to set up food centres," with no fences or boundaries to ease access, Trump told reporters after a meeting with British Prime Minister Keir Starmer at his golf resort in Turnberry, Scotland.

Starmer described the humanitarian situation in Gaza as"absolutely intolerable" and said food aid needs to be moved into the enclave quickly.

"We need to galvanise other countries in support of getting that aid in, and yes, that does involve putting pressure on Israel, because it absolutely is a humanitarian catastrophe," he said.