LIVE: Two White House national security aides who expressed concerns about Trump Ukraine call to appear on Hill

WASHINGTON, D.C. (ABC News) -Two White House national security aides who expressed concerns about a July phone call between President Donald Trump and Ukraine’s leader are appearing on Capitol Hill Tuesday, becoming the first current White House officials to testify publicly in the Democrats’ impeachment investigation.

Army Lt. Col. Alexander Vindman, the National Security Council’s Ukraine expert, will testify alongside Jennifer Williams, a national security aide to Vice President Mike Pence, in the morning.

Both officials listened in on Trump’s July 25 phone call with Ukrainian President Volodymyr Zelenskiy. Vindman and Williams have also come under attack from the president for offering their accounts to Congress.

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