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"We cannot have a peace process or a peace solution without the role of the United States," the monarch said on the CNN programme Fareed Zakaria GPS.

"This was true even after President Donald Trump decided to move the US embassy from Tel Aviv - where nearly every other country has its embassy - to Jerusalem," he said.

In December, Jordan had called Trump's move "a violation of decisions of international law and the United Nations charter," and Abdullah re-iterated his concerns to Vice President Mike Pence who visited the Middle East last month.

Abdullah noted on Sunday that Trump's decision had "created a backlash" by leaving Palestinians feeling "that there isn't an honest broker."

But, he added, "I'd like to reserve judgment, because we're still waiting for the Americans to come out with their (peace) plan."

Trump's decision was warmly embraced by Israel but widely decried around the world, sparking outrage and protests.

Palestinians claim East Jerusalem as the capital of an eventual Palestinian state and had hoped that peace talks might someday bring international recognition of that status.

"I think we have to give the Americans the benefit of the doubt and all work together" once the White House issues a peace plan, Abdullah said, while adding that "if it is not a good plan ... I don't think we've got a Plan B at this stage."

Jordan occupied the city's eastern sector in 1948, but Israel took control in the 1967 Six-Day War and has occupied it ever since.