Career diplomat, war veteran Lt. Col. Alexander Vindman fends off Republican questioning of his judgment and loyalty as he testifies at presidential impeachment hearing

Democrats say House session revealed a US president abusing his office for political gain, while Republicans insist that witnesses gave testimony that was secondhand at best

Surprise offer a bid to stem escalating efforts by Trump and his GOP allies to unmask the person's identity

White House allegedly tried to cover up details of president's phone call; intelligence chief Joseph Maguire calls whistleblower complaint 'unprecedented' amid impeachment calls