U.S. Ambassador to the European Union Gordon Sondland Gordon SondlandGOP chairman vows to protect whistleblowers following Vindman retirement over 'bullying' Top Democrat slams Trump's new EU envoy: Not 'a political donor's part-time job' Trump names new EU envoy, filling post left vacant by impeachment witness Sondland MORE is expected to appear for his scheduled House deposition next week, a House committee official confirmed to The Hill.

NBC previously reported that Sondland would appear, citing two congressional sources. The committee official confirmed in an email to The Hill that NBC's reporting was accurate.

NEWS: Ambassador Gordon Sondland *will appear for his scheduled deposition on Tuesday, October 10th, two congressional sources tell @AlexNBCNews. — Geoff Bennett (@GeoffRBennett) October 5, 2019

*Make that Tuesday, Oct. 8th — Geoff Bennett (@GeoffRBennett) October 5, 2019

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Sondland was among a group of five current and former State Department officials Democrats have wanted to depose as part of their impeachment inquiry into 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 over his dealings with Ukraine.

Leaders of the House Oversight, Foreign Affairs and Intelligence committees had sent a letter to the State Department seeking a deposition with Sondland next week, along with depositions with the other current and former officials.

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 later said the officials would not show up for the depositions, although since then, one of the officials has been questioned by lawmakers.

Sondland was mentioned in a recently released whistleblower complaint over a phone call in which President Trump asked Ukrainian President Volodymyr Zelensky to look into Democratic presidential candidate 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.

The complaint alleged that Sondland and former special envoy for Ukraine Kurt Volker Kurt VolkerGOP senators request details on Hunter Biden's travel for probe Yovanovitch retires from State Department: reports Live coverage: Senators enter second day of questions in impeachment trial MORE visited Kiev and met with Zelensky and other figures after Trump asked the Ukrainian leader to look into Biden.