Former CIA Director John Brennan said he is “concerned” about the rhetoric coming from some left-wing members of Congress as he warned about antifa’s “vigilantism.”

Juliette Kayyem, a professor at the Harvard Kennedy School of Government and a former assistant secretary at the Department of Homeland Security, broached the topic of left-wing radicalization in a conversation on Tuesday with the longtime intelligence officer, with the discussion moderator seeking a “sense of balance” as she noted there appears to be a great deal of focus by the FBI on right-wing extremism.