This is old stuff. Been posted here before. This happened several weeks ago right after the hurricane when this fool said this.
Old news - true. However, Spike Lee will be making a purported documentary about this canard.
http://www.cinematical.com/2005/10/12/spike-lees-katrina-documentary-to-investigate-levee-rumors
"I don't put anything past the United States government," he said. "I don't find it too far-fetched that they tried to displace all the black people out of New Orleans."
This just happened today. At the National Press Club. In DC. He's disseminated this moonbat conspiracy theory a couple of time before, then claimed he got it from Nagin, but these are his most extensive remarks to date.