United States President Donald Trump said on Saturday he and Israeli Prime Minister Benjamin Netanyahu discussed the possibility of moving forward on a “mutual defense” treaty between the allies, just three days before Israeli voters go to the polls.

“I had a call today with Israeli Prime Minister Netanyahu to discuss the possibility of moving forward with a Mutual Defense Treaty, between the US and Israel,” Trump tweeted.

He said such an agreement would “further anchor the tremendous alliance” between the two countries.

“I look forward to continuing those discussions after the Israeli elections when we meet at the United Nations later this month!” Trump added, giving a tacit last-minute endorsement to Netanyahu's re-election bid.

Taking to the same medium, Netanyahu thanked “his dear friend” Trump. “The Jewish State has never had a greater friend in the White House,” the Israeli premier tweeted.

“I look forward to our meeting at the UN to advance a historic Defense Treaty between the US and Israel.”

Netanyahu also pledged to “continue full steam ahead with our common battle against terrorism,” congratulating Trump “on your latest success against Bin Laden's son”.

Trump had earlier in the day confirmed that Hamza bin Laden, the son and designated heir of Al Qaeda founder Osama bin Laden, was killed in a counter-terrorism operation.

The comments come as the international community awaits the release of Washington's long-delayed Middle East peace plan, which Secretary of State Mike Pompeo recently said could come within weeks.

Its publication was pushed back after Israel scheduled new elections, set for Tuesday. Then last week, one of the key architects of the US plan, Jason Greenblatt, announced his resignation.

Trump has repeatedly boasted that he is the most pro-Israeli US president in history. He has slashed aid to the Palestinians, while making big concessions to the Israelis, including formalising US recognition of Jerusalem as the capital of the Jewish state.

As a result, the Palestinian Authority has cut off formal contact with the Trump administration, saying it is not an honest broker.

So far, Trump has not commented on Netanyahu's controversial pledge to annex Israeli settlements in the occupied West Bank as well as the Jordan Valley if re-elected — which would seem to go beyond US proposals for land swaps between Israel and the Palestinians.

Netanyahu, 69, is fighting his second election in five months with a potential corruption indictment looming. He suffered a major defeat in April, when his Likud party along with its right-wing and religious allies won a majority, but he failed to form a coalition.