Alexander Vindman

Impeachment witness Vindman sues Trump Jr. and Giuliani …

National Security Council Ukraine expert Lieutenant Colonel Alexander Vindman takes the oath before he testifies before the House Intelligence Committee, on Capitol Hill in Washington, DC on November 19, 2019. - (ANDREW CABALLERO-REYNOLDS/AFP via Getty Images)

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Trump Fires 2 Admin Officials Who Testified Against Him …

From left: U.S ambassador to the European Union Gordon Sondland makes an opening statement before testifying to the House Intelligence Committee on Nov. 20, 2019, and National Security Council Director for European Affairs Lt. Col. Alexander Vindman prepares to testify before the House Intelligence Committee on Nov. 19, 2019. (Credit: Drew Angerer / Chip Somodevilla / Getty Images)

At Trump Impeachment Hearings, Several Witnesses Highlight …

Fiona Hill and David Holmes return following a break to provide additional testimony before the House Intelligence Committee in the Longworth House Office Building on Capitol Hill Nov. 21, 2019 in Washington, D.C. (Credit: Drew Angerer/Getty Images)

Top Aide Describes Trump’s Call With Ukraine President …

Jennifer Williams, adviser to Vice President Mike Pence for European and Russian affairs, and National Security Council Director for European Affairs Lt. Col. Alexander Vindman are sworn in to testify before the House Intelligence Committee in the Longworth House Office Building on Capitol Hill November 19, 2019. (Credit: Chip Somodevilla/Getty Images)

‘There Was No Ambiguity’ That Ukraine Investigation Into …

U.S. Ambassador to the European Union Gordon Sondland arrives for a closed session before the House Intelligence, Foreign Affairs and Oversight committees Oct. 28, 2019, at the U.S. Capitol. (Credit: Mark Wilson/Getty Images)

Ukraine Expert: White House Deleted Trump’s Reference …

Army Lt. Col. Alexander Vindman, director for European Affairs at the National Security Council, arrives at the U.S. Capitol on Oct. 29, 2019, in Washington, D.C. (Credit: Mark Wilson/Getty Images)

Immigrant Who Became Decorated Army Officer Saw ‘Sacred …

Army Lt. Col. Alexander Vindman, director for European Affairs at the National Security Council, arrives at the U.S. Capitol on Oct. 29, 2019, in Washington, D.C. (Credit: Mark Wilson/Getty Images)

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National Security Official Testifies He Raised Concerns …

Army Lieutenant Colonel Alexander Vindman, Director for European Affairs at the National Security Council, arrives at a closed session before the House Intelligence, Foreign Affairs and Oversight committees on Oct. 29, 2019 (Credit: Alex Wong/Getty Images)