The Oath Keepers are a far-right militia, founded in 2009 by Stewart Rhodes. He’s one of five members currently on trial in Washington, facing charges of seditious conspiracy and other felonies related to the Jan. 6, 2021, attack on the U.S. Capitol. Prosecutors say they planned to stop the peaceful transfer of power from Donald Trump to Joe Biden following the 2020 election. Explosive, secretly recorded, audio from an alleged insurrection planning meeting was played last week in court.

Today, we’re joined by Andy Campbell, senior editor at HuffPost and author of the new book We Are Proud Boys. He explains who the Oath Keepers are and what’s been revealed at the trial about how the deadly attack may have been prevented.