[John W]

If by "prior knowledge" you mean thay had the pieces to the puzzle and din't put them together-both the Clinton & Bush administrations,I agree.No one,to my knowledge,from either administration has said "We messed up,big time."But,I don't believe they had specific foreknowledge of the 9/11 attack and did nothing to stop it.

[Trust but Verify]

IOW, we didn't know what we didn't know.