The Palestinian leadership has reportedly cut off communications with the Trump administration, CNN reported.

The move comes after the White House last week warned it could close the Palestine Liberation Organization's (PLO) office in Washington.

Ashraf Khatib, a spokesman for the PLO Negotiations Affairs Department, raised concerns about the "credibility of the American administration."

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"We are actually wondering how can we still talk to the American side while our offices in Washington are closed," Khatib said.

The State Department said it was looking into the issue, according to CNN.

A report Saturday said the Trump administration threatened to close down the group's office in Washington. The threat came after Palestinian President Mahmoud Abbas in a September speech to the United Nations General Assembly said Palestinians requested that the International Criminal Court "open an investigation" and "prosecute Israeli officials for their involvement in settlement activities and aggressions against our people."

A Statement Department official said Secretary of State Rex Tillerson Rex Wayne TillersonGary Cohn: 'I haven't made up my mind' on vote for president in November Kushner says 'Alice in Wonderland' describes Trump presidency: Woodward book Conspicuous by their absence from the Republican Convention MORE "concluded that the factual record, certain statements made by Palestinian leaders about the ICC, did not permit [Tillerson] to make the factual certification required by the statute."