What is the Commission's mandate?

http://www.9-11commission.gov/about/faq.htm#q1

The Commission's mandate is to provide a “full and complete accounting” of the attacks of September 11, 2001 and recommendations as to how to prevent such attacks in the future.

Specifically, Section 604 of Public Law 107-306 requires the Commission to investigate "facts and circumstances relating to the terrorist attacks of September 11, 2001," including those relating to intelligence agencies; law enforcement agencies; diplomacy; immigration, nonimmigrant visas, and border control; the flow of assets to terrorist organizations; commercial aviation; the role of congressional oversight and resource allocation; and other areas determined relevant by the Commission for its inquiry.

So... if the 9/11 Commission's mandate was to get a "full and complete accounting" of the attacks of September 11th, 2001, then why were certain things omitted? If certain things were omitted, does that not make the 9/11 Commission's findings null and void?

Here is an excerpt from a show called the "Washington Journal". On this particular show, Lee Hamilton, the co-chair for the 9/11 Commission was on the program discussing the "9/11 Public Discourse Project". This is a supposed "watchdog" group that makes sure the Government is doing everything they can to prevent the next terrorist attack, and to make sure the recommendations put forth by the Commission are implemented.

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As you can see, when Mr. Hamilton was confronted about Building 7, he stated that, "some things were left out of the report."

By his own admission, the 9/11 Commission did not give a "full and complete accounting" of the attacks on September 11th, 2001.

Therefore, the findings of the 9/11 Commission are NULL & VOID.