Another factor is the decision, made in 1976, to sharply divide the FBI and the foreign intelligence agencies. The FBI would collect within the United States; the foreign intelligence agencies would collect overseas.

It produces, probably produces, 80 percent of the intelligence the United States uses, ... The Puzzle Palace.

What we bring to the table is not only our 56 field offices in the United States and our number of resident agencies, but also we have 45 legal attaches overseas.

The only way to Cuba is with the CIA.

The homegrown terrorists are the most significant because any fighter returning from Syria to the United States would likely be identified and detected by our intelligence and law enforcement agencies.

Since the tragedies, the Department of Homeland Security was established to prevent terrorist attacks within the United States, and most importantly, to share intelligence information among government agencies and departments.