. >> reporter: and just fadtoday, a walk around ground zero, we heard both sides. >> i believe they would offer a side of islam that is peace-loving, the kind of neighborho neighbor we want to have here. >> this is radical islam building a triumphant 15-story building on the cemetery of their loved ones. >> reporter: unlike many people debating this issue from afar, both father kevin madigan and retired firefighter tim brown have deep emotional ties to 9/11. the father's church was just a block away from the towers. >> i was in the church when the first plane rushed the tower. i wanted to see if i could be any help. >> reporter: brown, who was detail to the mayor that day, lost 93 of his friends. >> we got within 20 feet of the door to tower two when it collapsed. you could hear the floors pancaking, hitting each other. >> reporter: brown is close to many victims' tam lips and has been a vocal critic of the center. >> they will be praying at the grave of their loved one and they will hear allahu akbar coming through the block. >> reporter: the call to prayer. >> the call to prayer. it is