Potential For More Extremist Violence; Tech Companies Take Action

Organizations tracking extremist groups say things could get worse before they get better. The mayor of Washington, D.C., is preparing for "armed extremists" on Inauguration Day. The Anti-Defamation League's CEO joins us. Also, after last week's insurrection, Amazon Web Services, Apple and Google have suspended the conservative social media app Parler. This comes after Twitter permanently banned Trump. The Atlantic's Derek Thompson details the fallout.