Three committees leading the House impeachment probe are asking White House acting chief of staff Mick Mulvaney to appear for a closed-door interview Friday.
The panels on Tuesday wrote to Mulvaney requesting his appearance, saying they believe he has "first-hand knowledge" of President Donald Trump's dealings with Ukraine.
In a televised news conference last month at the White House, Mulvaney appeared to acknowledge that Trump held up military aid to Ukraine partly for political reasons. He then later denied that he had said it.
Mulvaney is one of 13 witnesses that the Democrats have called to testify behind closed doors this week. It is unclear if he will show up since Trump has directed members of his administration not to cooperate.
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