thousands and thousands of american muslims celebrating in new jersey when the twin towers fell. have you ever seen this video? >> i don't recall. when i heard it mentioned, something clouding my memory that there may have been some people here in this country who were sympathetic to isis, but what i remember very vividly actually was a candle light vigil in tehran. the iranian people, not the iranian government, the iranian people being very sympathetic toward the loss of life here in the united states. so that's the video that i remember much more than maybe rumors or thoughts that -- not that i don't remember something like that, but i can't tell you that i ever saw anything. >> senator santorum, thank you so much. >> you bet. >> back to our world lead now in the war against isis. cnn went to the front lines of this war just outside the syrian city of raqqah, which is really a virtual ghost town right now that isis considers its