US President Joe Biden will announce in his State of the Union speech on Thursday that the US military will construct a port on Gaza's Mediterranean coast to receive humanitarian assistance by sea, senior administration officials said.

The officials also said at a news briefing that Hamas is delaying a new deal with Israel on releasing hostages because it has not agreed to free sick and elderly hostages, the officials told reporters.

In his speech to Congress, Biden will announce that he has ordered the US military "to undertake an emergency mission to establish a port in Gaza, working with like-minded countries and humanitarian partners," one of the officials said.

The port, which would be temporary, would increase the amount of humanitarian assistance to Palestinians in the war-battered enclave by "hundreds of additional truckloads" per day, the official said, adding that the United States would coordinate security with Israel.

It also would work with the UN and humanitarian aid organizations that "understand the distribution of assistance within Gaza," the official said, adding that initial supplies would come from Cyprus.