The House impeachment hearings are scheduled to continue Thursday with the highly anticipated testimony from Fiona Hill, a former top National Security Council expert on Russia, and David Holmes, a State Department official. Their scheduled appearances will follow Wednesday's marathon day of testimony, most notably from Gordon Sondland, the U.S. ambassador to the European Union, whose remarks raised eyebrows on both sides of the aisle. Hill is among several witnesses who have testified behind closed doors. It is believed she played a central role in a July 10 meeting at the White House in which Sondland and Acting White House...