Alexander Vindman's full opening statement at impeachment hearings

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The first public presidential impeachment hearings in over 20 years continue on Tuesday with lawmakers' busiest day yet.

National Security Council aide Lt. Col. Alexander Vindman walks toward the holding room as he waits testify before the House Intelligence Committee on Capitol Hill on Nov. 19, 2019.Manuel Balce Ceneta / AP

Nov. 19, 2019, 9:52 AM EST

By NBC News

Two aides who were listening in on the July 25 phone call between President Donald Trump and Ukrainian President Volodymyr Zelenskiy testified Tuesday as part of the House's impeachment inquiry.

Read the full opening statements from National Security Council staffer Lt. Col. Alex Vindman and Jennifer Williams, an aide to Vice President Mike Pence, below: