Robert Spencer on ISIS' Intent to Conquer Rome and Behead the Pope

I sat down recently with Robert Spencer, author of The Complete Infidel's Guide to ISIS, to discuss the terror group's plan for Rome. While the idea of ISIS conquering Rome may sound ridiculous, Quranic Muslims––not just in ISIS-–believe the fall of Rome must take place before the final battle against the infidel armies at Dabiq, Syria and the return of the Mahdi, the Muslim "messiah."