Negative. That would be a very presumptuous power grab. The offer to organize the relief under Federal umbrella was made on Friday, Sept 2nd. A wwek before that, there was no disaster, and no certainty that Louisiana would suffer any more damage than it had handled before.
The languge in the WaPo article also indicates (but does not recite) Friday, September 2nd.
DangerKitty no like Blanco