The January 6th Committee presents evidence that Donald Trump knew he lost the 2020 election. Also, the Supreme Court denies Trump's request to intervene in the classified documents case. Plus, the Fulton County district attorney doesn't rule out calling on Trump to testify in the Georgia election probe. And a new video shows congressional leaders reacting to the riot at the Capitol. Andrew Weissmann, Barry Berke, Professor Laurence Tribe, Gwen Keyes Fleming, Michael Beschloss and Claire McCaskill join Lawrence O'Donnell.