The mastermind behind the Sept. 11, 2001 attacks expected the United States to respond as if it were a law enforcement matter, according to psychologist James E. Mitchell.

What Khalid Sheik Mohammed and others reportedly did not plan for, however, was a quick and fierce response from the full weight of the U.S. armed forces, Mitchell, who interrogated the 9/11 mastermind, claimed in his new book “Enhanced Interrogation: Inside the Minds and Motives of the Islamic Terrorists Trying To Destroy America.”