Though their physical caliphate has been gone for more than five years, the terrorist organization ISIS has survived—through propaganda, in chatrooms, and as an inspiration and cheerleader for actions like the New Years’ Eve attack in New Orleans.

Guest: Colin P. Clarke, Director of Research at The Soufan Group, a nonprofit research group focusing on global security, author of “After the Caliphate: The Islamic State and the Future Terrorist Diaspora.”

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Podcast production by Elena Schwartz, Paige Osburn, Anna Phillips, Madeline Ducharme and Rob Gunther.

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What Next | Is ISIS Back? Or Did It Never Leave?