RIYADH - The Organisation of Islamic Cooperation on Monday called for a summit of Muslim nations if the United States takes the controversial decision to recognise Jerusalem as Israel's capital.

President Donald Trump faces a key decision this week over Jerusalem's status, potentially reversing years of US policy and prompting a furious response from the Palestinians and the Arab world.

The 57-member OIC sought to amplify concern over the possible move in an emergency meeting on Monday in the Saudi Red Sea city of Jeddah.

"If the United States takes the step of recognising Jerusalem as the so-called capital of Israel, we unanimously recommend holding a meeting at the level of council of foreign ministers followed by an Islamic summit as soon as possible," the pan-Islamic body said in a statement. The OIC also warned that recognising Jerusalem or establishing any diplomatic mission in the disputed city would be seen as a "blatant attack on the Arab and Islamic nations ".

The status of Jerusalem is one of the most contentious issues of the long-running Israeli-Palestinian conflict.

Most of the international community, including the United States, does not formally recognise Jerusalem as Israel's capital, insisting the issue can only be resolved through final-status negotiations.

Central to the issue of recognition is the question of whether Trump decides to move the US embassy in Israel to Jerusalem. All foreign embassies are located in Tel Aviv with consular representation in Jerusalem.

Israelis and Palestinians are eagerly watching to see whether he again renews a waiver delaying the move, as his predecessors have done.

There are suggestions that Trump will sign the waiver and decline to move the embassy for now, but later this week declare Jerusalem as Israel's capital.

Israel, which seized the largely Arab eastern sector of Jerusalem during the 1967 Six-Day War and later annexed it, claims both halves of the city as its "eternal and undivided capital".

But the Palestinians want the eastern sector as capital of their promised state and fiercely oppose any Israeli attempt to extend sovereignty there.

Several peace plans have come unstuck over debates on whether, and how, to divide sovereignty or oversee the city's sites holy to Christians, Jews and Muslims.

A Jordanian court on Monday sentenced a Syrian man to death by hanging for carrying out a "terrorist" attack in 2016 that killed seven soldiers near a border crossing.

Three other Syrians initially given the death penalty were jailed for life and a fifth received a two-year sentence, said an AFP reporter who attended the hearing at the state security court.

All five were arrested and put on trial in March after a June 2016 suicide bombing killed seven soldiers and wounded 13 in no-man's land near the Rukban border crossing with Syria.

Soon after the attack, the army declared Jordan's vast desert regions stretching northeast to Syria and east to Iraq "closed military zones".

The move stranded tens of thousands of Syrian refugees in the area and sparked calls by international relief agencies for Jordan to ease the measure.

The military court sentenced Najm al-Umur, 21, to death by hanging after he was convicted of "terrorist activity leading to the death of individuals".

Umur, considered to be the mastermind behind the attack, was described in the charge sheet as a member of the Islamic State group.

The status of Jerusalem is one of the most contentious issues of the long-running Israeli-Palestinian conflict, and the suggestion Trump could reverse years of US policy has prompted a furious bout of lobbying from the Palestinian leadership.

Most of the international community, including the United States, does not formally recognize Jerusalem as Israel's capital, insisting the issue can only be resolved through final status negotiations.

Central to the issue of recognition is the question of the US embassy.

All foreign embassies are located in Tel Aviv with consular representation in Jerusalem, but Trump will on Monday have to decide whether to sign a legal waiver that would delay by six months plans to move the US embassy from the Holy City.

The Arab League said it was closely following the matter, with leader Abul Gheit warning any such move would pose a threat "to the stability of the Middle East and the whole world."

"It will not serve peace or stability, instead it will nourish fanaticism and violence," he said on Sunday, noting that the League was closely following the issue and would coordinate a joint position with Palestinian and Arab leaders if Trump took the step.

Jordan's Foreign Minister Ayman Safadi also warned that any change to the status of Jerusalem would have "grave consequences", in a phone conversation with US Secretary of State Rex Tillerson on Sunday.

It was crucial, he said, "to preserve the historical and legal status of Jerusalem and refrain from any decision that aims to change that status," the official Petra news agency reported.

In 1995, the US Congress passed the so-called Jerusalem Embassy Act recognizing Jerusalem as Israel's capital and stating that the US embassy should be moved there.

But an inbuilt waiver, which allows the president to temporarily postpone the move on grounds of "national security", has been repeatedly invoked by successive US presidents, from Bill Clinton, George W. Bush and Barak Obama, meaning the law has never taken effect.

Trump is expected to begrudgingly sign the waiver for a second time this week.

But according to diplomats and observers, he is expected to make a speech on Wednesday announcing his support for Israel's claim on Jerusalem as its capital.

Israel seized the largely-Arab eastern sector of Jerusalem during the 1967 Six-Day War and later annexed it, claims both halves of the city to be its "eternal and undivided capital."

But the Palestinians want the eastern sector as capital of their promised state and fiercely oppose any Israeli attempt to extend sovereignty there.

Several peace plans have come unstuck over debates on whether, and how, to divide sovereignty or oversee the sites holy to Christians, Jews and Muslims.

In an address to the Saban Forum of Israeli and US policymakers on Sunday, Kushner, who heads a small and tight-knit White House negotiating team, suggested a decision was close.

"He's still looking at a lot of different facts and when he makes his decision he'll be the one who wants to tell you. So he'll make sure he does that at the right time," he said.

Palestinians have been lobbying regional leaders to oppose the decision and the armed Islamist movement Hamas has threatened to launch a new "intifada."

Late on Sunday, Palestinian president Mahmud Abbas spoke to Hamas leader Ismail Haniya, with the two agreeing to oppose any shift in US policy.

Saeb Erakat, secretary general of the Palestine Liberation Organization, also warned that a change in the US stance on Jerusalem would spell disaster, warning that it would amount to an own goal for US peace efforts in the region.

He said in a statement that Washington would "be disqualifying itself to play any role in any initiative towards achieving a just and lasting peace."

Trump has said he wants to relaunch frozen peace talks between Israel and the Palestinians in search of the "ultimate deal".

But analysts warn that any major shift in US policy would make that goal more difficult to achieve.