You make it sound as though Bush had anything to do with this speech. It was something Columbia did entirely on its own and it was roundly, heavily criticized for it. And it did not repeat.This was taking place:
"The introduction of Mahmoud Ahmadinejad at Columbia University. 9/24/07"
Seemed pretty silly to me, "kill him and bomb his nation", but only after he finishes speaking to the kids naturally.