Jordan has warned of "grave consequences" if US President Donald Trump decides to recognize Jerusalem as the capital of Israel, as the Arab League chief said any such move would boost fanaticism and violence.

Jordan’s Foreign Minister Ayman Safadi told his US counterpart Rex Tillerson by phone Sunday that it was "necessary to preserve the historical and legal status of Jerusalem and refrain from any decision that aims to change that status", official Petra news agency said.

Trump's son-in-law and Middle East peace envoy Jared Kushner said Sunday that the president was close to a decision on whether to recognize Jerusalem as Israel's capital.

Palestinian leaders are lobbying desperately against such a move.

Safadi warned of "grave consequences of any decision to recognize Jerusalem as the capital of Israel given the city's special religious, historical and national status -- not just for Jordanians and Palestinians but across the Arab and Muslim worlds".

Jordan's top diplomat said such a move would damage American efforts to revive peace talks between Israel and the Palestinians, warning it could "push the region towards more tension".

Safadi called for emergency meetings of the Arab League and the Organization of the Islamic Conference to "discuss how to deal with any American move to recognize Jerusalem as the capital of Israel".

On Monday, Trump must decide whether to sign a legal waiver that would delay plans to move the US embassy from Tel Aviv to Jerusalem for another six months.

The status of Jerusalem is a key issue in the Israeli-Palestinian conflict. 

Both Israelis and Palestinians claim the city as their capital and previous peace plans have come unstuck over debates on whether, and how, to divide sovereignty or oversee holy sites.

"It is unfortunate that some are insisting on carrying out this step without any regard to the dangers it carries to the stability of the Middle East and the whole world," Ahmed Abul Gheit, head of the Arab League, told reporters in Cairo on Sunday.

Abul Gheit said the Arab League is closely following the issue and is in contact with the Palestinian authorities and Arab states to coordinate the Arab position if Trump takes the step.

"Nothing justifies this act... it will not serve peace or stability, instead it will nourish fanaticism and violence," said Abul Gheit.

The move would "benefit only one side, which is the anti-peace Israeli government," he told reporters.

On the other hand, Recognizing Jerusalem as Israel’s capital would be an act of “naked aggression” that would cause the United States to lose “its mediating role” in the Middle East, the Organization of Islamic Cooperation said.

The statement by the group, representing 57 countries, came as President Donald Trump delayed a waiver on moving the U.S. embassy from Tel Aviv to Jerusalem that presidents have routinely issued since 1995 when Congress passed a law mandating the move.

The resolution issued Monday after an emergency meeting at the OIC headquarters in Jeddah, Saudi Arabia “warns against recognizing Al-Quds as the capital of Israel, the occupying power, or establishing or transferring any diplomatic mission to Al-Quds, given that this is considered a naked aggression not only on the Arab and Islamic Ummah, but also on the rights of Muslims and Christians alike, and on the Palestinian people’s national rights, including their right to self-determination.” Al Quds is the Arabic name for Jerusalem. The Islamic Ummah refers to the worldwide Muslim community.

Recognizing Jerusalem as Israel’s capital would cause “the United States to lose the legal and moral ground and its mediating role, and turning it into a biased party to the conflict,” the resolution said.

Trump’s deadline for issuing the waiver, which according to the law must be issued every six months, was Friday Dec. 1. On Monday evening, the White House said it would be delayed.

“No action will be taken on the waiver today,” an official said to JTA in an email. “We will share a decision on the waiver in the coming days.”

Trump, who campaigned on a promise of moving the embassy, walked it back after assuming the presidency. Recent reports say that he was unhappy with his first waiver issued in June and wants to go ahead and recognize Jerusalem as Israel’s capital as early as Wednesday. There have been conflicting details of what such a recognition would encompass, and whether it would involve moving the embassy.

Palestinian officials have said that moving the embassy would scuttle attempts to revive Israeli-Palestinian peace talks led by Jared Kushner, Trump’s son-in-law. Kushner, in a rare public appearance this weekend, said he was optimistic about restarting the talks.

Significantly, Saudi Arabia on Monday also warned against recognizing Jerusalem as Israel’s capital. Kushner has become close to the Saudi crown prince, Muhammad bin Sultan, and has sought his help in advancing the peace process.

“Any U.S. announcement on the status of Jerusalem prior to a final settlement would have a detrimental impact on the peace process and would heighten tensions in the region,” Saudi Ambassador Prince Khalid bin Salman, Mohammed’s brother, was quoted by Reuters as saying. “The kingdom’s policy has been and remains in support of the Palestinian people, and this has been communicated to the U.S. administration.”

French President Emmanuel Macron also warned Trump against the move in a phone call. “Mr. Emmanuel Macron reaffirmed that the question of Jerusalem’s status had to be dealt with in the framework of peace negotiations between Israelis and Palestinians, with the aim in particular to establish two countries, Israel and Palestine, living in peace and security side by side with Jerusalem as capital,” Reuters quoted the president’s office as saying after the call on Monday.

The White House’s readout of the call said only that Macron and Trump “discussed the path to peace in the Middle East.”

Also weighing in was Sen. Dianne Feinstein, D-Calif. Recognizing Jerusalem as Israel’s capital would “erode American credibility as an unbiased mediator, alienate us from our international partners — such as Jordan — and undermine any remaining hope for a two-state solution,” Feinstein said in a letter sent Friday to Trump.

Jordan’s King Abdullah persuaded Trump to walk back from his campaign promise soon after Trump assumed office. Under an arrangement, Jordan maintains some control of the Muslim holy sites in Israel’s Old City.

Israel has made clear it would welcome the move. Ron Dermer, the Israeli ambassador to Washington, told Politico on Monday that recognizing Jerusalem as Israel’s capital would convey to Palestinians a message of “Hey, wake up. Understand that Jerusalem is Israel’s capital. You have to deal with that reality.”

Jerusalem’s mayor, Nir Barkat, meeting with the American Jewish Committee in New York, urged Trump to “go with your heart.” “I pray and hope the president will do the right thing this time,” he said.