>> well, you can muster all the resources you have. the challenge is applying them effectively and efficiently. ultimately i got to new orleans the week after the event occurred to relieve mike brown. the only way we met that challenge was a door-to-door sweep of every building in the affected area. we were able to accomplish that with d.o.d. support where you had high-water vehicles and communications with security support. so you have to marshal the folks to back you up to do a comprehensive sweep. the challenge is that it's such a broad spectrum and then you have the difference in abilities of very small cities and large cities like houston. it's going to be a challenge. >> former commandant of the coast guard, thad allen. it is always good to talk to you and get the benefit of your experience and expertise. thank you so much. >> my pleasure, chris. and happening now, fema administrators in washington, d.c., about to start a briefing on tropical storm harvey.