Congressional staffers report being traumatized after Jan. 6 attack, as GOP downplays violence

Tonight on the Last Word: The mother of fallen Capitol Police Officer Brian Sicknick met with Republican senators and pleaded with them to support the 1/6 commission. Also, a small group of Senate Republicans unveil a $928 billion infrastructure counterproposal. Plus, Democrats stress the need for expansive voting protections as Republicans advance bills to restrict voting. And vaccination rates rag among Latino and Black Americans. Rep. Ted Lieu, Remmington Belford, Neal Katyal, Bharat Ramamurti, Rep. Colin Allred and Dr. Ilan Shapiro join Lawrence O’Donnell.