Leaked confidential documents show that Tenet signed a warning letter, which urged the 9/11 Commission not to "probe too deeply" into the attacks. The

Leaked confidential documents show that Tenet signed a warning letter, which urged the 9/11 Commission not to "probe too deeply" into the attacks. The letter also urged them to stop trying to question terror suspects.

The letter can be read here:
http://www.aclu.org/files/assets/CIA.pdf