Writing in the New Yorker, Lawrence Wright asks: Could Unlimited Phone Surveillance Have Prevented 9/11?.
Yes, the F.B.I. could have stopped 9/11. It had a warrant to establish surveillance of everyone connected to Al Qaeda in America. It could follow them, tap their phones, clone their computers, read their e-mails, and subpoena their medical, bank, and credit-card records. It had the right to demand records from telephone companies of any calls they had made. There was no need for a metadata-collection program. What was needed was coöperation with other federal agencies, but for reasons both petty and obscure those agencies chose to hide vital clues from the investigators most likely to avert the attacks.