Biden remembered those who were killed and called for unity going forward.
Former President Donald Trump's historic second impeachment trial ended with a 57-43 vote to acquit in the Senate. He faced a single charge of incitement of insurrection over his actions leading up to the Jan. 6 riot at the U.S. Capitol.
The Senate has recessed for the day after roughly eight hours of arguments from House impeachment managers.
The House managers will continue laying out their case charging Trump with "incitement of insurrection" at noon on Thursday.
Trump's legal team will have its turn to respond to the House impeachment managers' arguments on Friday and, if more time is needed, on Saturday.
-ABC News Trish Turner
Moments before the Senate was to adjourn for the evening, there was confusion in the chamber as Sen. Mike Lee, R-Utah, challenged comments made by Rep. David Cicilline, D-R.I.
Lee said that the account of a phone call Cicilline described was not "factual," and argued that as the witness he should be able to have the remarks stricken from the record.
However, the senators are not supposed to speak on the floor during impeachment proceedings. If they have questions, they are supposed to be submitted in writing. Lee's request prompted confusion on the dais and from the floor where several senators were unclear what was happening.
Rep. Jamie Raskin, D-Md., was acknowledged and returned to the microphone to withdraw that portion of Cicilline's remarks.
"The impeachment manager Mr. Cicilline correctly and accurately quoted a newspaper account which the distinguished senator has taken objection to, so I am happy to withdraw it, but on the grounds that it is not true -- we will withdraw this evening and without any prejudice to resubmit it, and we can debate if we need to, but this is much ado about nothing because it's not critical in our case."
-ABC News' Trish Turner and Benjamin Siegel
Rep. Joaquin Castro, D-Texas, argued that rioters were reading Trump's tweets in real time as the Capitol was stormed and that many took their cues from the president.
"The mob was paying attention," Castro said. "They were paying attention. And they also followed instructions."
House impeachment managers played a video of one notable protester, Jacob Anthony Angeli Chansley, who stormed the Capitol wearing face paint, no shirt and a furry hat with horns. In the video, he told a reporter it was time to go home from the Capitol only once Trump put out a pre-recorded video -- over three-and-a-half hours after the attack began.
"When President Trump had the opportunity to confront them as a leader of us all as the commander-in-chief, what did he tell them? We love you. You are very special," Castro said, after playing the clip. "This was not a condemnation for this is a message of consolation, of support, of praise."
Finally, he said Trump "commemorated" the day with a final tweet at 6:01 p.m., saying, "Remember this day forever!"
"Our commander-in-chief -- who is known for sending 108 tweets in a normal day -- sends five tweets and a prerecorded video. That is the entirety of President Trump's public statements from when the attack began until he went to bed on Jan. 6. That is all he did," Castro said.
"How easy would it have been for the president to give a simple command, a simple instruction, just telling them, stop. Leave?" Castro asked the Senate earlier.
Rep. Joaquin Castro, D-Texas, continued to present the House impeachment managers' detailed timeline of the events at the Capitol and White House on Jan. 6, and said Trump did nothing to quell the protests even as those close to him asked for him to do so, suggesting Trump was the only one who could stop the siege. Instead, Castro said, Trump continued to incite the mob with tweets as violence was already underway.
"As this was unfolding and the crowd grew more violent, the president, of course, was not alone at the White House. And the people closest to him, his family, his advisers who saw this unfolding in real time, begged him -- implored him to stop the attack," Castro said, showing tweets and playing media appearances of both former and current Trump officials and lawmakers as they called on Trump, during the attack, to ask his supporters to go home.
Castro highlighted how Trump tweeted -- over an hour and a half into the attack at 2:24 p.m., while Pence was still sheltered inside the Senate chamber -- that Pence did not have "courage" to overturn the results as some rioters repeated the tweets on megaphones outside like marching orders. He then recounted how Trump tweeted at 3:13 p.m. to his supporters, still storming the Capitol, to "remain peaceful" and ended his tweet with a "Thank you!"
"Thank you for what? Thank you for shattering the windows and destroying property? Thank you for injuring more than 140 police officers?" Castro said.
The Texas representative also drew a clear distinction between Trump and Pence, despite his personal politics not matching to either.
"Mike Pence is not a traitor to this country. He is a patriot. And he and his family, who was with him that day, didn't deserve this, didn't deserve a president unleashing a mob on them. Especially because he was just doing his job," Castro said.
