The ex-CIA director allowed his publisher to begin editing and making copies of the memoir before he had received final approval from the agency, according to people familiar with the project.
Despite a push to track foreign fighters in the region, U.S. authorities did not flag Florida-born Moner Mohammad Abusalha, who detonated a truck in Syria in May.
The Khorasan threat raises concerns about leaving a vestige of al-Qaeda intact.
The agency director’s criticisms echo the frustrations of law enforcement officials nationwide.
FBI director would not name the Islamic State suspect who beheaded Americans and a British aid worker.
Some U.S. officials described the Khorasan group as “nearing the execution phase” of a terrorist plot but others said there was no indication of a specific plan.
After he spent years installing constraints on counterterrorism operations, the U.S. is on a significantly different course.
Agencies remain uncertain about the danger that the militant group poses to the United States.
13 years after 9/11, U.S. operations rage on against terrorist groups in Pakistan, Somalia and Yemen.
Journalist Steven Sotloff was kidnapped in 2013 and was being held by the Islamic State.