Trump impeachment trial live updates: Biden says charge 'not in dispute' in 1st comments on acquittal

The district attorney's office in Fulton County, Georgia, has formally launched a criminal probe into Trump's efforts to overturn his election loss in the state, after Trump was heard in a January phone call pleading with Secretary of State Brad Raffensperger to help him "find 11,780 votes," the exact number he needed to win Georgia.

The launching of the investigation was revealed in a letter from District Attorney Fani Willis to state officials asking them to preserve any documents potentially related to the 2020 general election, "with particular care given to set aside and preserve those that may be evidence of attempts to influence the actions of persons who were administering" it, which would include Trump's Jan. 2 phone call with the secretary. The existence of the letter was first reported by the New York Times and obtained by ABC News.

"This investigation includes, but is not limited to, potential violations of Georgia law prohibiting the solicitation of election fraud, the making of false statements to state and local governmental bodies, conspiracy, racketeering, violation of oath of office and any involvement in violence or threats related to the election's administration," Willis writes in the letter.

Senior aides to the House impeachment managers said they plan to show "never before seen" security camera footage offering a view of the Capitol during the Jan. 6 riot "that has never been published before."

"We have the goods, we will be presenting the goods," said a senior aide.

When asked about whether they had body camera footage from law enforcement, aides dodged the specifics, but said it would provide "new insight into the extreme violence and risk" people faced on Jan. 6.

They plan to try the case against Trump like a criminal prosecution with "a beginning, middle and an end." 

"The Trump team really has one strategy, and that is to talk about anything and everything else, besides the President's actions on that day in the lead up," an aide said. 

-ABC News' Rachel Scott, Benjamin Siegel, Katherine Faulders, Trish Turner, Mariam Khan and Allison Pecorin

Rep. Adam Kinzinger, R-Ill., who voted in the House to impeach President Donald Trump, told ABC News Live Prime anchor Linsey Davis that he believes it is possible, but not likely, that more Senate Republicans will vote to convict Trump. Kinzinger estimates there will not be enough to get to 67 votes, though he also said if the Senate impeachment vote was held in private, he believes it would "certainly" pass.

"I think over time, people are going to wake up to really how bad, at least, the tone was in the last four years, particularly Jan. 6, and I don't think history is going to judge too kindly those that stood by and picked politics over that oath-keeping decision," Kinzinger said.

The Republican congressman also discussed the future of the GOP and said that if the party continues to go in the direction he feels it's going in, he wouldn't be able to "stay under the Republican banner."

"I'm determined to fight for my party, but if it continues down this track, and there's no hope for it. I certainly wouldn't be able to stay under the Republican banner as much as I want to, you know, I need to be associated with a party that's optimistic about the future," Kinzinger said. "And I'm not there yet. I'm going to fight for the soul of this party and down the road, hopefully, that won't be a decision I'll have to make."

-ABC News' Jon Schlosberg

The Senate kicked off former President Donald Trump's second impeachment trial on Tuesday with Democrats using a 13-minute video of the Jan. 6 Capitol riot to help make their case to the Senate, and Trump's defense team debating the constitutionality of the trial of a former president.

Here are three takeaways from the first day of arguments, which ended with the Senate voting 56-44 to proceed with the trial.

Trump's legal team, including Bruce Castor Jr., a former district attorney of Montgomery County, Pennsylvania, made a poor first impression in a 48-minute argument that garnered criticism from senators who found themselves confused and unimpressed.

Senators, many of whom were in the Capitol during the Jan. 6 riots, relived the attacks during a documentary-style video of the Capitol riot, a harrowing presentation that meshed C-SPAN footage of staid House and Senate floor debates with gritty, expletive-laden riot footage and some of the former president's social media posts.

Democrats also cited conservative lawyers who backed the trial, saying that not trying Trump would suggest to future presidents that they would not be held accountable for their actions during their final days in office.

-ABC News' Benjamin Siegel