29 Aug. 2019
Democrats in the U.S. House of Representatives began an inquiry on Sept. 24 to determine whether President Donald Trump abused his office for political gain when he asked Ukrainian President Volodymyr Zelenskiy in a July phone call to investigate political rival Joe Biden, a former vice president.
The contents of the call were revealed in a whistleblower complaint by an intelligence official. Testimony by Trump administration officials past and present, a rough transcript of the phone call released by the White House, texts between U.S. diplomats and other documents have largely confirmed the whistleblower's account.
Trump denies wrongdoing and says he is the victim of a witch hunt by Democrats.
Here's what we know so far:
(Compiled by Ross Colvin; editing by Grant McCool)