"...Cerantonio's word on this topic is hardly final, even for Islamic State devotees: Only God knows what "Rome" is. But his wrestling with these questions gives a sense of the tenor of the Islamic State's discussion of prophecy, which is not about if but when, where, and who. And that discussion remains active, with participants marshaling evidence from scripture, history, linguistics, and other fields to support their own theory of the end of times. Trump's interpretation of "Rome"—identifying it with the modern city, and describing it as a key ISIS target—reads the Islamic State's favorite prophecies even more narrowly than many of its own followers do..."
http://www.theatlantic.com/international/archive/2016/02/donald-trump-pope-isis/470307/
http://www.theatlantic.com/international/archive/2016/02/donald-trump-pope-isis/470307/