The House adopted one article of impeachment against Trump of "incitement of insurrection", alleging that Trump incited the January 6 storming of the U.S. Capitol.
The House impeachment managers formally triggered the start of the impeachment trial on January 25 by delivering to the Senate the charge against Trump.
The nine managers walked into the Senate chamber led by the lead impeachment manager, Rep. Jamie Raskin, who read the article of impeachment.
At the trial, the first of its kind for a departed US president (with Johnson, Clinton, and Trump have all been the incumbent in prior impeachment trials), a two-thirds majority of senators is needed to convict Trump.
A conviction would trigger a second vote in which a simple majority in the Senate could permanently disqualify Trump from holding federal office in the United States.