Reuters / Tuesday, October 29, 2019
Lt. Col. Alexander Vindman, director for European Affairs at the National Security Council, arrives to testify as part of the U.S. House of Representatives impeachment inquiry into U.S. President Trump led by the House Intelligence, House Foreign Affairs and House Oversight and Reform Committees on Capitol Hill in Washington. REUTERS/Erin Scott
Vindman is the first impeachment witness to have listened in on the July 25 call between Trump and Ukrainian President Volodymyr Zelensky, during which Trump said he wanted a “favor” after Zelensky broached defense cooperation between the U.S. and Ukraine, a key component of which is American military aid.