Former Secretary of Defense Dr. Robert Gates recently stopped by Business Insider to talk about his new book "A Passion For Leadership: Lessons on Change and Reform From Fifty Years of Public Service."
We asked Gates what he considers to be the main factors that led to the existence of ISIS.
Produced by Graham Flanagan and Pamela Engel
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EX-PENTAGON CHIEF: These are the 2 main reasons ISIS was born
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