Rev. Al Sharpton: 'Political violence has to stop'

Rev. Al Sharpton, host of MSNBC’s PoliticsNation and founder of the National Action Network, joins The Weeknight as the FBI tries to track down the shooter who killed conservative activist Charlie Kirk. In a new MSNBC.com column, Symone Sanders Townsend warns: “Democracy cannot function under fear. The constitutional promise of free speech means nothing if you can be killed while speaking your mind.”