Pres. Biden calls for tighter gun control: ‘We have to act’

Tonight on the Last Word: Republicans downplay the need for stricter gun control laws. Also, new videos obtained by the New York Times show Officer Sicknick minutes before being attacked in the Capitol riots. Plus, Democrats move closer to changing the filibuster to pass the voting rights bill. Vice President Harris is tasked with “stemming the migration” on the southern border. And Democrats push for gun control after two mass shootings kill 18 people. Rep. Joe Neguse, Andrew Weissmann, Sen. Jeff Merkley, Julián Castro and Rep. Lucy McBath join Lawrence O’Donnell.