Kurt Volker, President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE's former special envoy for Ukraine, has confirmed he will appear at a deposition before Congress this Thursday, a House official said.

The House Intelligence Committee official also said that Marie Yovanovitch, the former U.S. ambassador to Ukraine, will appear for a deposition on Oct. 11. She was previously scheduled to appear this Wednesday.

The committee official confirmed that Volker’s appearance before three House committees would remain as scheduled after Secretary of State Mike Pompeo Michael (Mike) Richard PompeoWatchdog confirms State Dept. canceled award for journalist who criticized Trump Trump's push for win with Sudan amps up pressure on Congress Putin nominated for Nobel Peace Prize MORE signaled Tuesday he would block current and former State Department officials from testifying before Congress as part of House Democrats’ impeachment inquiry, citing “significant legal and procedural concerns” raised by the requests.

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“Ambassador Volker has confirmed he will appear this Thursday. Ambassador Yovanovitch, who was previously scheduled for this Wednesday, will now be appearing on Oct. 11 with the agreement of both the Committees and counsel. The Committees will provide additional information in the coming days,” the committee official said.

The State Department did not immediately return a request for comment.

House Democrats have requested testimony from five current and former State Department officials in connection with the inquiry, which centers on a July 25 conversation between Trump and Ukrainian President Volodymyr Zelensky.

During the call, Trump encouraged the foreign leader to open an investigation into unsubstantiated allegations against former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE, a 2020 Democratic presidential candidate.

Pompeo responded to the request for testimony Tuesday, accusing Democrats of trying to “intimidate” and “bully” State Department officials. He raised legal concerns regarding the depositions, accusing the committee of not giving the department proper notification and refusing to allow State Department counsel to participate in the interviews.

“This amounts to an attempt to circumvent the Executive Branch’s unquestionably legitimate constitutional interest in protecting potentially privileged information related to the conduct of diplomatic relations,” Pompeo wrote.

“Therefore, the five officials subject to your letter may not attend any interview or deposition without counsel from the Executive Branch present to ensure that the Executive Branch’s constitutional authority to control the disclosure of confidential information, including deliberative matters and diplomatic communications, is not impaired,” Pompeo continued.

He asserted that the current deposition schedule was “not feasible.”

Legal experts say Pompeo would have little power to prevent the former officials from testifying now that they are private citizens.

It’s unclear whether the other officials will ultimately agree to testify.

Democratic chairmen Eliot Engel Eliot Lance EngelHouse panel halts contempt proceedings against Pompeo after documents turned over Engel subpoenas US global media chief Michael Pack The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep MORE (N.Y.), Adam Schiff Adam Bennett SchiffSchiff to subpoena top DHS official, alleges whistleblower deposition is being stonewalled Schiff claims DHS is blocking whistleblower's access to records before testimony GOP lawmakers distance themselves from Trump comments on transfer of power MORE (Calif.) and Elijah Cummings Elijah Eugene CummingsBlack GOP candidate accuses Behar of wearing black face in heated interview Overnight Health Care: US won't join global coronavirus vaccine initiative | Federal panel lays out initial priorities for COVID-19 vaccine distribution | NIH panel: 'Insufficient data' to show treatment touted by Trump works House Oversight Democrats to subpoena AbbVie in drug pricing probe MORE (Md.) responded by accusing Pompeo of witness intimidation, suggesting he could be accused of obstructing the probe. The Democrats cited reports that Pompeo participated in the July call between Trump and Zelensky, saying that would make him a “fact witness.”

Democrats have also requested State Department Deputy Assistant Secretary George Kent, State Department counselor T. Ulrich Brechbuhl and U.S. Ambassador to the European Union Gordon Sondland appear for depositions.