Ali Soufan, author of 'The Black Banners' and former FBI Special Agent
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Did the CIA withhold critical information that could have prevented the 9/11 terror attacks? Former FBI special agent Ali Soufan, a lead interrogator in the post-9/11 interrogations of al Qaeda suspects, says the answer is an emphatic "Yes". He speaks to Douglas Herbert about what he calls the CIA’s continuing efforts, 11 years later, to discredit his version of events.