As the top Ukraine expert on the National Security Council, Army Lt. Col. Alexander S. Vindman became so concerned during a July 25 phone call in which President Trump asked Ukraine’s president for help with political investigations that he reported his alarm to a superior.
New York Times: Who is Alexander Vindman?
National Security Council Ukraine expert Lieutenant Colonel Alexander Vindman arrives to appear in closed-door deposition hearing as part of the impeachment inquiry at the US Capitol in Washington, DC, on Nov. 7, 2019.