How IS justifies brutality with an apocalyptic vision

Aired: 11/2/2015 | 0:06:20 | Clip
The Islamic State militant group is taking advantage of chaos and upheaval in the Middle East to recruit fighters by prophesying the end of days, says William McCants, an early Islam historian. McCants joins chief foreign affairs correspondent Margaret Warner to discuss his new book “The ISIS Apocalypse: The History, Strategy, and Doomsday Vision of the Islamic State.”