For only the fourth time in US history, the House of Representatives has started a presidential impeachment inquiry.
House committees are trying to determine if President Donald Trump violated his oath of office by asking Ukraine to investigate political rival Joe Biden and his family, and to investigate the country's involvement in the 2016 US presidential election.
The three House committees leading the Democratic investigation have scheduled several current and former National Security Council officials to testify this week behind closed doors — an attempt to get a better look inside the White House as Trump pushed Ukraine to conduct politically motivated