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WASHINGTON, DC - FEBRUARY 07:  U.S. Assistant to the President for Homeland Security and Counterterrorism John Brennan, nominated by U.S. President Barack Obama to be the next Director of the Central Intelligence Agency, testifies before the Senate Intelligence Committee February 7, 2013 in Washington, DC. Brennan was expected to face sharp questioning on the U.S. military drone program in addition to questions about his nomination to head the CIA.  (Photo by Alex Wong/Getty Images)
WASHINGTON, DC - FEBRUARY 07:  U.S. Assistant to the President for Homeland Security and Counterterrorism John Brennan, nominated by U.S. President Barack Obama to be the next Director of the Central Intelligence Agency, testifies before the Senate Intelligence Committee February 7, 2013 in Washington, DC. Brennan was expected to face sharp questioning on the U.S. military drone program in addition to questions about his nomination to head the CIA.  (Photo by Alex Wong/Getty Images)

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CIA director sends dire warning on ISIS

In an interview with CBS, CIA director John Brennan says ISIS is committed to obtaining weapons of mass destruction. CNN's Carol Costello reports.

CIA director sends dire warning on ISIS

In an interview with CBS, CIA director John Brennan says ISIS is committed to obtaining weapons of mass destruction. CNN's Carol Costello reports.