House Democrats accuse Trump of abusing his power in office by orchestrating a pressure campaign to get Ukraine to investigate former Vice President Joe Biden, a leading Democratic political rival, as well as launch a probe into a debunked conspiracy theory about the 2016 presidential elections.
The House impeachment investigation centred on a whistle-blower complaint in which Trump spoke to Ukrainian President Volodymyr Zelenskyy on the phone and asked for the investigation into Biden.
At the time of the call, the Trump administration was withholding nearly $400m in military assistance to Ukraine.
During the impeachment inquiry, Trump refused to participate and urged current and former administration staffers to do the same.
He was impeached on December 18 for abuse of power and obstruction of Congress.