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. Subscribe to the CBS News Channel HERE: https://bit.ly/2uz8qYE Watch CBSN live HERE: http://cbsn.ws/1PlLpZ7 Follow CBS News on Instagram HERE: https://www.instagram.com/cbsnews/ Like CBS News on Facebook HERE: http://facebook.com/cbsnews Follow CBS News on Twitter HERE: http://twitter.com/cbsnews Get the latest news and best in original reporting from CBS News delivered to your inbox. Subscribe to newsletters HERE: http://cbsn.ws/1RqHw7T Get your news on the go! Download CBS News mobile apps HERE: http://cbsn.ws/1Xb1WC8 Get new episodes of shows you love across devices the next day, stream CBSN and local news live, and watch full seasons of CBS fan favorites like Star Trek Discovery anytime, anywhere with CBS All Access. Try it free! http://bit.ly/1OQA29B --- CBSN is the first digital streaming news network that will allow Internet-connected consumers to watch live, anchored news coverage on their connected TV and other devices. At launch, the network is available 24/7 and makes all of the resources of CBS News available directly on digital platforms with live, anchored coverage 15 hours each weekday. CBSN. Always On.