Did al-Qaida trainee warn FBI before 9/11?

More than a year before 9/11, a Pakistani-British man told the FBI an incredible tale: that he had been trained by bin Laden’s followers to hijack airplanes and was now in America to carry out an attack. The FBI questioned him for weeks, but then let him go home, and never followed up. Now, the former al-Qaida insider is talking.

Note that this happened in 2000 while Clinton was still "shaking the trees".