provided materiel support to terrorists. sheikh mohamud, u.s. citizen, trained to use firearms and explosives and returned home from syria planning to target a u.s. military facility. joining us now former congresswoman jane harmon served on the homeland security committees now president of the wilson center. cnn counter terrorism analyst phil mudd former cia official national security analyst peter bergen and cnn intelligence and security analyst bob bair former cia operative pap 23-year-old man, naturalized u.s. citizen. what's the appeal of these kinds of individuals to actually leave the united states of america, fly to turkey cross into syria, train with a terrorist group and come back to the united states with instructions to kill americans? >> we talked about the appeal being isis propaganda ideology. you can lead a simpleler life overseas allowing you to practice islam at its forms.