Alexander Vindman, an army lieutenant colonel, to tell Congress the phone call between Trump and Zelenskiy raised internal alarm

Alexander Vindman, an army lieutenant colonel and the top Ukraine expert, is expected to tell Congress on Tuesday that a July phone call between Donald Trump and the Ukrainian president, Volodymyr Zelenskiy, caused him to raise an internal alarm. The testimony could weigh heavily in the impeachment inquiry.

Read his full opening statement here: