Jan. 6 Cmte. argues Trump’s rhetoric galvanized rioters

Tonight on the Last Word: The January 6th Committee reveals details of the “unhinged” December 18 meeting with conspiring Trump allies. Also, a rioter says he would have left the Capitol earlier if Donald Trump had told the mob to leave sooner. Plus, senior White House officials repeatedly advised Trump to concede. And the Jan. 6th Cmte. reveals extremists’ ties to the riot mob. Barry Berke, Daniel Goldman, Harry Dunn, Olivia Troye and Kathleen Belew join Lawrence O’Donnell.