can't we require young people before they buy a gun to study and learn how to handle and safely store firearms. in many states we have hunter safety courses and they're required to pass a test. i think it's the next natural step. >> over the weekend, senator elizabeth warren said it's not just mass shootings that we should focus on. but places like chicago where gun violence on an individual level is out of control. how do you tackle both of these things? >> well, i think you have to look at everything. we reached out in colorado and i think this is a good foundation for national policy. we started working with the shooting ranges, the gun stores to help them make sure that the people that are using the weapons know how to safely store them. you keep them under lock and key, you don't keep your ammunition in the same place.