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Expert Michael Leiter: ‘Cancer’ of terror is an enormous challenge


Commenting on the deadly truck attack in Nice, France, on Thursday, Michael Leiter, former director of the National Counterterrorism Center, tells TODAY that even though French police are very experienced with large events like the Bastille Day celebration during which at least 84 people were killed, better security and education are required to beat the “spreading cancer” of terror through social media. (Run time: 3:22)