Will McCants of the Brookings Institution and David Ignatius of The Washington Post sat down with Ryan Evans to chat about the topic of Will's new book, ISIS Apocalypse: The History, Strategy, and Doomsday Vision of the Islamic State. In this wide-ranging conversation, our guests reached back into the origins of the Islamic State and came all the way up to the storm of violence that covers so much of the Middle East today. Have a listen!