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"We are still in agreement that reaching a two-state solution through negotiations is the only solution," Heiko Maas said during a press conference in Amman with his Jordanian counterpart.

Washington is gearing up to roll out economic aspects of its plan at a June 25-26 conference in Bahrain, but it is not yet clear when its political details will be unveiled.

The Palestinians will boycott the conference and have already rejected the deal, citing a string of moves by US President Donald Trump they say show his administration is irredeemably biased.

"We and Germany agree that the two-state solution is the only way to end the conflict," Jordanian Foreign Minister Ayman Safadi said.

Maas' visit to Jordan is part of a wider trip to the Middle East seeking to de-escalate tensions between Iran and the United States.

The German foreign minister visited Iraq on Saturday and expected in Iran on Monday.

Mass and Safadi met a day after US ambassador to Israel David Friedman was quoted by the New York Times as saying Israel had the "right" to annex at least parts of the occupied West Bank.

Palestinian leaders said the US envoy's comments showed "extremists" were involved in White House policy on the issue.

Israel occupied the West Bank in the 1967 Six-Day War and its construction of settlements there is viewed as a major stumbling block to peace.

Friedman has in the past been a supporter of Israeli settlements as has the family of Jared Kushner, Trump's son-in-law and adviser leading efforts to put together the peace deal.

Kushner has hinted that it will not endorse international calls for the creation of a Palestinian state.

Last week, Kushner suggested in an interview that the Palestinians are not ready to govern themselves.

"The hope is, is that over time, they can become capable of governing," Kushner said when asked if he believes the Palestinians can govern themselves without Israeli interference.

Several UN resolutions have enshrined the two-state solution, which envisages separate homelands for Israelis and Palestinians, as the path to a peace settlement.

But following persistent expansion of the settlements by successive Netanyahu governments, more than 600,000 Jewish settlers now live in the West Bank, including annexed east Jerusalem, among some three million Palestinians.

Another key broker in the peace process, the United Nations, says it will stay away from the Bahrain meeting.

Both ministers also stressed the importance of the United Nations agency for Palestinian refugees, just weeks after the US called for it to be dismantled after cutting its roughly $300 million annual donation.

Jordan is home to nearly 2.2 million Palestinian refugees, who make up almost half of the kingdom's population.

Separately, Mass said Germany would give Jordan a $100 million loan to help cope with economic difficulties in the kingdom where IMF-backed fiscal reforms sparked mass protests last year.

Jordan, whose stability is seen as vital for the volatile Middle East, also hosts some 1.3 million refugees from neighbouring war-torn Syria.