Exception is the people from Katrina were US citizens not illegally in the US.
Check it out:

Officials say that nearly a thousand illegal immigrants a day are crossing into Texas from Mexico, an anomaly that is now being compared to Hurricane Katrina.

“How do you prepare for that?” says Don Ray, the Executive Director of the Texas Border Sheriffs Coalition. “You can’t have an influx of people like that without having an impact; I think we saw that after Katrina. It’s relocation services that are really taking place. In the case of Katrina, most of them were United States citizens or people that were here lawfully, and now you have people that aren’t here lawfully.”