The militia movement in America has a long, embattled history — and President Trump ushered in a new chapter with his sweeping grant of clemency to the more than 1,500 people charged for their involvement in the Jan. 6, 2021, attack on the U.S. Capitol. ProPublica reporter Joshua Kaplan sat down with Apple News In Conversation host Shumita Basu to talk about the message these pardons send and the insights of a unique source who secretly infiltrated and climbed the ranks of militia groups in America.