Former Mayor Rudolph Giuliani says now is not the time to assess the government's response to Hurricane Katrina. He says people withheld their analysis for some time after the Nine Eleven attacks.

GIULIANI: People weren't critiquing this a week later and two weeks later and three weeks later. They appropriately waited a period of time and then the September 11th commission did it and they did it in a responsible way, they tried to point out the things that were done right, the things that were done wrong and how you can improve from it.

REPORTER: Giuliani was among the officials who toured the new Tribute Center across the street from the World Trade Center site. It offers tours of the site by volunteers who survived the attacks or lost a family member. Organizers say these tours give visitors a personal connection to the site.