The chairman of the Sept. 11 Commission, Tom Kean, and vice-chair Lee Hamilton have written a new book, Without Precedent: the Inside Story of the 9/11 Commission.

The two write about the challenges of completing their work on the commission with little money, a tight timeline, constant wrangling to gain access to classified documents, and the necessity of forging a consensus among Republican and Democratic commissioners. Kean talks about his experience.

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