US House impeachment investigators on Tuesday summoned President Donald Trump’s acting chief of staff Mick Mulvaney for a deposition, saying he has “substantial first-hand knowledge” of Trump’s efforts to pressure Ukraine. Mulvaney is the latest administration official to be ordered to testify with the impeachment probe closing in around those nearest the president as it proceeds into a new public phase, in which transcripts of closed-door testimony are being released. Mulvaney is the highest-ranking White House official to be summoned in the probe, although he is unlikely to comply given the White House’s opposition to administration officials cooperating with investigators.
