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Analyst: Bin Laden not easily replaceable

04:17

Peter Bergen, a CNN security analyst and author of “The Longest War: Enduring Conflict Between America and Al Qaeda,” tells NBC’s David Gregory that “replacing (bin Laden) is going to be very difficult” for al-Qaida and says Ayman al-Zawahiri, bin Laden’s number two, is “not well-liked” within the organization.