Officials supplied a detailed briefing to President Bush and Secretary of Homeland Security Chertoff a couple of days before Katrina made landfall. The possiblity of levees breaching was brought to his attention. Bush did not ask a single question, but kept assuring the briefers that every arrangement was being made to meet the situation. The AP (see report) has obtained a videotape of this briefing.
Why is this important? Here's why. The following week, Bush told ABC Good Morning America that "No one could have anticipated the breach of the levees". What does it prove?