Trump impeachment trial live updates: Biden makes 1st comments on acquittal

Breaking the silence in the chamber after playing out the managers' first video, lead House impeachment manager Rep. Jamie Raskin said, "If that's not an impeachable offense, then there is no such thing."

Raskin also made an appeal to senators' interest in defending the prerogatives of the legislative branch: If they acquit Trump, they will be ceding power to the executive branch. 

"If the president's arguments for a January exception are upheld, then even if everyone agrees that he's culpable for these events, even if the evidence proves, as we think it definitively does, that the president incited a violent insurrection on the day Congress met to finalize the presidential election, he would have you believe there is absolutely nothing the Senate can do about it. No trial, no facts. He wants you to decide that the Senate is powerless at that point. That can't be right," he said. 

Citing the impeachment of Warren Hastings in the Parliament of Great Britain, Raskin said the Framers of the Constitution supported impeaching former officials. He also said the power of Congress to impeach, convict and disqualify a president from holding future office are needed the most during a transfer of power, Raskin argued, adding, "That's precisely when we need them the most, because that's when elections get attacked." 

"Given the Framers' intense focus on danger to elections and the peaceful transfer of power, it is inconceivable that they designed impeachment to be a dead letter in the president's final days in office when opportunities to interfere with the peaceful transfer of power would be most tempting and most dangerous, as we just saw," he said. 

Rep. Joe Neguse, D-Colo., took the floor after Raskin.

-ABC News Benjamin Siegel

Inside the Senate's first impeachment trial of a former president -- and the first during a global pandemic -- a pool of reporters were permitted to cycle inside, one at a time to witness the floor activity not necessarily captured by cameras stationed there.

ABC News' Trish Turner noted that every senator was in the chamber for the start. Republicans could be seen handing in their electronics as they entered the chamber though the GOP cloakroom as phones are not allowed during the trial. 

At the Trump legal team desk, closest to the lectern, sat Trump's four attorneys: David Schoen, Bruce Castor, Michael van der Veen and Julieanne Bateman, along with a legal aide. At the House managers table sat Rep. Jamie Raskin, D-Md., with counsel Barry Berke and a legal aide. 

Schoen and Sen. Patrick Leahy, D-Vt., the president pro tempore presiding over the trial, made small talk before the trial started. 

All senators were masked up but a handful including Sen. Cynthia Lummis, R-Wyo., Sen. James Risch, R-Wis., and Sen. Rand Paul, R-Ky.

Van der veen was the only lawyer at the Trump table reading and marking up documents. The others each sat with a blank, yellow legal pad. 

When asked if they were an opponent or proponent of the constitutional question, Raskin and then Castor said, "We're a proponent" and "We're an opponent," respectively. 

Another reporter from the pool described the atmosphere in the chamber as "incredibly tense" while senators watched the video compilation from Raskin of the assault on the Capitol. 

Almost every senator was watching the video, most wearing frowns, the reporter noted, and the sounds of the video appeared to echo in the chamber, "filling it with the screams and yells of the mob."

-ABC News' Trish Turner

Rep. Jamie Raskin, D-Md., argued for the historical precedent of impeachment, arguing that the Framers had impeachment of a person no longer in office in mind when drafting the Constitution.

"President Trump may not know a lot about the Framers, but they certainly knew a lot about him," Raskin said. "Given the Framers' intense focus on danger to elections and the peaceful transfer of power, it is inconceivable that they designed impeachment to be a dead letter in the president's final days in office when opportunities to interfere with the peaceful transfer of power would be most tempting and most dangerous, as we just saw."

Senators gathered on Tuesday for the historic second impeachment of Trump, the first trial of a former a president and one in which the lawmakers are themselves witnesses to the insurrection at the Capitol.

Here are photos of the Jan. 6 attack on the Capitol.