Lt. Col. Alexander Vindman Alexander VindmanImpeachment witness Alexander Vindman calls Trump Putin's 'useful idiot' The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump, Biden renew push for Latino support Strzok: Trump behaving like an authoritarian MORE, a top White House expert on Ukraine, testified on Tuesday in the House impeachment inquiry into President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE.

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Vindman described attacks on him and other witnesses as “reprehensible” and “cowardly.”

He also recognized career officials for their courage in coming forward to raise concerns about the administration’s policies toward Ukraine.

Read his opening statement below.

Read Vindman opening statement on Scribd