What is that quote from, do you know?
September 13th would have been two days after 9-11; did we know that soon? He spoke at to the nation o 9-15, but I don't rememeber any specific speeches or interviews where he might have said that before that address.
As for this quote:
"I don't know where bin Laden is. I have no idea and I really don't care. It's not that important. It's not our priority." -- George W. Bush, March 13, 2002
I never heard or read he said that.