National Terrorism Advisory warns of potential threat from domestic extremists
The Department of Homeland Security issued a National Terrorism Advisory warning of the potential for violence from domestic extremists in the coming weeks. Meanwhile the FBI says it's combing through over 200,000 tips related to the attack on the U.S. Capitol. CBS News senior investigative correspondent Catherine Herridge joins CBSN's "Red & Blue" anchor Elaine Quijano with the latest on the investigation and what prompted security officials to issue the warning.