The House impeachment managers plan to show senators previously unseen Capitol security footage on Wednesday as they seek to illustrate the violence unleashed by a pro-Trump mob last month and the imminent risk it posed to top government leaders, according to senior aides.
The video is likely to be a chilling highlight on the first day of prosecutors’ formal presentation of evidence. Over eight or more hours, they will try to prove that the assault was the climax of a monthslong campaign instigated by former President Donald J. Trump, fueled by lies about a stolen election and aimed at overturning his loss.
Taking aim at Republican senators drifting toward acquittal, they plan to argue that none of the deadly violence that followed would have happened without him, according to the aides, who spoke on condition of anonymity to preview the day’s proceedings.
They declined to reveal what the security footage would show, but the Capitol complex is vast, and its surveillance system extensive. The video could allow the managers to flesh out the publicly available record — featured dramatically in a 13-minute video they showed on Tuesday at the start of the trial — with a richer timeline of events. That would show senators precisely what was happening inside the Capitol as the mob breached the building and police tried to hold them off while lawmakers and Vice President Mike Pence met for the official counting of electoral votes to formalize President Biden’s victory.
Mr. Pence and members of the House and Senate were evacuated with just minutes to spare, and the aides said the House prosecutors would emphasize to senators sitting in judgment of Mr. Trump how much worse the attack could have been.
They are also expected to continue to use extensive footage shot by the rioters themselves and news video of Mr. Trump’s own words. Some Republican senators reported that the video the managers presented on Tuesday, providing the longest look to date at the scope of what had happened, was deeply impactful.