sins of the father. i talk to the son of the mastermind behind the attack on the world trade center. when did you find out what your father said was untrue, that he misled you? we begin tonight with the president s address two hours ago. he laid out his new strategy to stop the lightening fast advance of the islamic state group, including military action in syria, and relying on a broad coalition of allies. we continue to face a terrorist threat. we can t erase every trace of evil from the world, and small groups of killers have a capacity do great harm. it was the case before 9/11, and it remains true today. that is why we must remain vigilant as threats emerge. at this moment the greatest threats come from the middle east and north africa, where radical groups exploit weakness for their own games, and one is i.s.i.l., which calls itself the islamic state. let s make two things clear - i.s.i.l. is not islamic. no religion condones the killing of minutes, and the vast maj