Two administration officials did not appear Tuesday for scheduled testimony in the House 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, making them the latest White House aides to skip planned depositions.

Wells Griffith, a special assistant to the president and senior director for international energy and environment on the National Security Council, did not appear for his Tuesday morning deposition. Michael Duffey, associate director for national security at the Office of Management and Budget (OMB), was absent for his closed-door hearing slated for Tuesday afternoon.

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The move came the same day House Democrats released transcripts of depositions with U.S. Ambassador to the European Union Gordon Sondland and former U.S. special envoy to 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.

Sondland revised his earlier testimony, saying in the latest version that the president’s dealings with Ukraine amounted to a clear quid pro quo.

House Democrats are seeking testimony from Griffith because of his participation in a July meeting at the White House with Ukrainian officials, while Duffey was subpoenaed over his alleged involvement in withholding the $400 million in aid to Ukraine, The Washington Post reports.

Acting OMB Director Russell Vought — who has been called to testify on Wednesday — took to social media earlier this month to say neither he nor Duffey planned to give depositions in a probe that the White House has called "illegitimate."

"I saw some Fake News over the weekend to correct. As the WH letter made clear two weeks ago, OMB officials - myself and Mike Duffey - will not be complying with deposition requests this week. #shamprocess,” he tweeted on Oct. 21.

Four White House officials also opted not to testify before the three panels overseeing impeachment — the House Intelligence, Foreign Affairs and Oversight and Reform committees — on Monday.

“We may infer by the White House obstruction here, that their testimony would be further incriminating of the President,” House Intelligence Committee Chairman 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 (D-Calif.) said Monday.