US Secretary of State Marco Rubio on Sunday fully endorsed Israel's war aims in the Gaza Strip, saying Hamas “must be eradicated” and throwing the shaky ceasefire into further doubt.

Rubio met with Israeli Prime Minister Benjamin Netanyahu in Jerusalem at the start of a regional tour, where he is likely to face pushback from Arab leaders over President Donald Trump's proposal to transfer the Palestinian population out of Gaza and redevelop it under US ownership.

Netanyahu has welcomed the plan, and said he and Trump have a “common strategy” for Gaza's future. Echoing Trump, he said "the gates of hell would be open” if Hamas does not release dozens of remaining hostages abducted in its Oct. 7, 2023, attack that triggered the 16-month war.

Their remarks came two weeks before the ceasefire's first phase is set to end. The second phase, in which Hamas is to release dozens of remaining hostages in exchange for more Palestinian prisoners, a lasting truce and the withdrawal of Israeli forces, has yet to be negotiated.

Ceasefire deal should be canceled if Hamas doesn’t release all hostages by Saturday: Trump

Rubio said Hamas cannot continue as a military or government force. “As long as it stands as a force that can govern or as a force that can administer or as a force that can threaten by use of violence, peace becomes impossible,” he said. "It must be eradicated.”

Such language could complicate continued talks with Hamas, which remains in control of Gaza despite suffering heavy losses in the war.

Rubio is also set to visit regional heavyweights the United Arab Emirates and Saudi Arabia.

The Israeli military meanwhile said it carried out an airstrike Sunday on people who approached its forces in southern Gaza. The Hamas-run Interior Ministry said the strike killed three of its policemen while they were securing the entry of aid trucks near Rafah, on the Egyptian border.

Hamas called the attack a “serious violation” of the ceasefire and accused Netanyahu of trying to sabotage the deal.