(CNN) House Democratic impeachment investigators have issued subpoenas to three Trump administration officials whose testimony was previously scheduled, in a sign the Democrats are trying to compel testimony from Trump officials who are apparently reluctant to appear.

The committees said subpoenas have been issued to acting Office of Management and Budget Director Russ Vought, OMB's Associate Director of National Security Programs Michael Duffey and State Department Counselor Ulrich Brechbuhl. The subpoenas call for Duffey to appear on November 5 and Vought and Brechbuhl to testify on November 6.

The committees leading the Democratic impeachment inquiry — Intelligence, Foreign Affairs and Oversight — have issued subpoenas to current State Department and Pentagon officials the morning of their testimony, in an effort to combat the Trump administration directing officials not to participate. But these appear to be the first subpoenas that would seek testimony from officials who were unwilling to testify when they had been initially scheduled.

It's not clear whether the subpoenas will prompt any of the three officials to participate. All had been scheduled for depositions earlier this month that were then removed from the deposition calendar.

Both OMB and the State Department — in addition to other federal agencies and the White House — have already failed to comply with House subpoenas from the impeachment inquiry for documents.

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