raised, the big pot of money that helped us create the interstate, the golden gate bridge, all of these magnificent structures. the gas tax hasn't been raised since 1993. the largest portion is in the building trades. people who build roads and bridges. let's get them working again. mr. secretary, details are emerging about the crash of the metrojet in egypt. given what we know, how concerned are you about our transportation system's va vulnerability to isis? >> thank goodness since 9/11, none of our planes have been brought down. and i do feel that people are feeling safe these days. but we have to be vigilant. i believe that the fbi and cia and law enforcement are taking it seriously.