As the Senate Intelligence Committee chairman during the aftermath of the Sept. 11 attacks and the run-up to the Iraq war, Sen. Bob Graham tried to expose what he came to believe were national security coverups and manipulations by the Bush administration. But he discovered that it was hard to reveal a coverup playing by the rules. Much of the evidence the Florida Democrat needed to buttress his arguments was being locked away, he found, under the veil of politically motivated classification.

Now, as he prepares to retire after 18 years in the Senate, the normally cautious former governor of Florida is unleashing himself in a new book, "Intelligence Matters: The CIA, the FBI, Saudi Arabia and the Failure of America's War on Terror."