Destroyed communications network made it hard to create a centralized command center.
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Officials try to squelch slow response complaints.
Congress not expected to reject independent commission's recomendations.
Failures of initial effort may serve as a catalyst for overhaul of emergency response apparatus.
Critics say Bush administration axed Clinton-era program because it worked.
John Warner, R-Va., Seeks review of how president may legally circumvent an 1878 law prohibiting the military from participating in law enforcement activities at home.
More than two dozen senators call on president to appoint single official to oversee federal spending on recovery efforts.
In the fourth of a series of reports from New Orleans, Chris Strohm describes how Blackhawk helicopters filled with agents secured the city's perimeter in quick order.
"Americans have every right to expect a more effective response in a time of emergency," president says in address to nation.
Recommendations made a year ago could have improved the government’s response to Hurricane Katrina, commissioners say.