Tonight on the Last Word: The January 6 Committee subpoena top Trump allies who publicly promoted false claims about the 2020 election. Also, the Senate debates voting rights ahead of a key vote. And Lawrence begins a new series, “A House Divided,” analyzing a divided America and speculation about another civil war. Rep. Zoe Lofgren, Neal Katyal, Sen. Amy Klobuchar, Barbara Walter and Kurt Andersen join Lawrence O’Donnell.