The first public hearings in the House Democrats' ongoing impeachment inquiry into President Trump’s requests for Ukraine to investigate his political rivals are under way in Washington, D.C., with William Taylor, the top U.S. diplomat in Ukraine, and George Kent, a senior State Department official, testifying in an open session. Ousted U.S. ambassador to Ukraine Marie Yovanovitch will testify Friday. Yahoo News is providing a live, uninterrupted video stream