Following four hours of debate where both sides presented their arguments, the senators are now voting on the constitutionality of an impeachment trial for a president who has already left office.
A simple majority is needed to proceed.
Here's a recap of what each side said during their portion of the debate:
House impeachment managers: Rep. Jamie Raskin of Maryland, the lead impeachment manager, opened his presentation with a video showing disturbing footage of how protesters overran police and ransacked the Capitol. The video was spliced with former President Trump's speech on Jan. 6 ahead of the riots, showing the crowd's reaction to Trump as he urged them to head to the Capitol.
The Democrats' 13-minute video concluded with Trump's deleted tweet on Jan. 6, saying that "these are the things and events that happen when a sacred landslide election victory is so unceremoniously & viciously stripped away."
"If that's not an impeachable offense, then there's no such thing," Raskin argued.
Trump's defense team: Trump's team has contended that the impeachment trial itself is unconstitutional, while arguing that Trump did not incite the rioters and that his speech about the election was protected by the First Amendment.
Trump's attorney Bruce Castor warned that a second impeachment trial in 13 months would "open the floodgates" to future impeachments, even making the unfounded rhetorically suggestion that former Obama administration Attorney General Eric Holder could be impeached.
After Castor deferred to Trump's other lawyer David Schoen, the tone of the defense team changed starkly. Schoen charged that Democrats were using impeachment as a political "blood sport" to try to keep Trump from running for office again.