(AP Photo | Jacquelyn Martin, Pool) Rep. Chris Stewart, R-Utah, questions Jennifer Williams, an aide to Vice President Mike Pence, and National Security Council aide Lt. Col. Alexander Vindman, as they testify before the House Intelligence Committee on Capitol Hill in Washington, Tuesday, Nov. 19, 2019, during a public impeachment hearing of President Donald Trump's efforts to tie U.S. aid for Ukraine to investigations of his political opponents.