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WASHINGTON — House Democrats pursuing an impeachment inquiry of President Donald Trump say they will subpoena the White House on Friday for documents related to his dealings with Ukraine, citing “flagrant disregard” of their previous requests for information.

House Oversight and Reform Chairman Elijah Cummings wrote in a memo to committee members Wednesday that the action is necessary because the White House has ignored multiple requests. Given the “stark and urgent warnings” the inspector general for the intelligence community has delivered to Congress, Cummings said, the panel has “no choice but to issue this subpoena.”

The subpoena is directed toward acting chief of staff Mick Mulvaney. It requests 13 separate batches of documents related to a July phone call that Trump had with Ukrainian President Volodymyr Zelenskiy and related matters. The Oversight panel will issue the subpoena in coordination with the House intelligence and Foreign Affairs committees, Cummings said.

The action came as House and Senate staff prepared to meet with the State Department’s inspector general on Wednesday. A State Department invitation to the meeting, which was reviewed by The Associated Press, requested an “urgent” meeting with staff from eight House and Senate panels.

The invitation said only that the inspector general, Steve Linick, “would like to discuss and provide staff with copies of documents related to the State Department and Ukraine.” The documents were obtained from the State Department’s acting legal adviser, according to the email.

Secretary of State Mike Pompeo acknowledged Wednesday he was on the phone call between Trump and Zelenskiy that is at the center of the impeachment inquiry. He said that as America’s chief diplomat he is well-versed in U.S. policy toward Ukraine. But Pompeo continued to push back against what he said was Democrats’ “bullying and intimidation.”

The Trump administration has set a defiant tone, resisting Congress’ access to witnesses, even as House Democrats warn such efforts themselves could amount to an impeachable offense.

Democrats have scheduled closed-door depositions Thursday with former special envoy to Ukraine Kurt Volker and next week with ousted U.S. Ambassador Marie Yovanovitch.