(Andrew Harnik | AP file photo) In this Nov. 19, 2019 photo, National Security Council aide Lt. Col. Alexander Vindman is sworn in to testify before the House Intelligence Committee on Capitol Hill in Washington during a public impeachment hearing of President Donald Trump's efforts to tie U.S. aid for Ukraine to investigations of his political opponents. Vindman was escorted out of the White House complex on Friday, Feb. 7, 2020, according to his lawyer.