What complete BS! The Boston Bombers did their thing with all this surveillance in place. There is no reason to believe the dots would have been connected when their were so many dots to connect in the Boston case. The ball was dropped then and there is no reason to believe it would not have been dropped 9-11. Talk about trying to cover your worthless spying on the American people liar ass.
"Amid ongoing debate about the propriety of U.S. government programs tracking private citizens' phone and internet use, FBI Director Robert Mueller said Thursday that the government might have prevented the 9/11 terrorist attacks had similar surveillance programs been in place in 2001."
"Mueller, addressing the House Judiciary Committee just months before the end of his 12-year tenure, outlined a sequence of intelligence data that was collected leading up to the attacks, and argued that the controversial programs, which collect telephone numbers and metadata, could have helped national security experts connect the dots relating to the plan -- and even "derailed" it entirely."
FBI director: Surveillance programs might have prevented 9/11 - CBS News