Obama: "If you have a handful of people who don’t mind dying, they can kill a lot of people."

Speaking from the G-20 summit in Antalya, Turkey, the president gets at one of the big challenges of counterterrorism. Despite the wealth of resources France has thrown into beefing up its security state, the perpetrators of the most recent attack were able to slip through. 

Obama also ruled out sending in troops to fight a ground war against ISIS.