ABC This Week interviews during 2015: on Gun Control

Donald Trump: Keep enemies of the state away from guns

TRUMP: We have to have a watch list, but we have the laws already on the books as far as Second Amendment for guns, if people are on a watch list or people are sick, this is already covered in the legislation that we already have,

Q: But under current law people on the watch list are allowed to buy guns.

TRUMP: If somebody is on a watch list and an enemy of state and we know it's an enemy of state, I would keep them away, absolutely.

Chris Christie: Gun laws ineffective; focus on mental health

CHRISTIE: I don't think there is. But I'll tell you this, I'm very concerned about the mental health side of this. Let's do some tough things on mental health, let's make involuntary commitment of people who speak violently easier for doctors. I think that makes sense. But let's remember something else, in many of the places around this country where they have the toughest gun laws, they have the highest violent crime rates. Violence in America that's happened on our streets in our cities, like Chicago, up 19 percent, the murder rate. New York, up 11 percent. And you have some of the most aggressive gun laws in cities like that. So let's enforce the law.

Donald Trump: Gun violence is inevitable; regulations won't help

TRUMP: No matter what you'll do you have people that are mentally ill and they have problems and they're going to slip through the cracks.

Q: So no new gun laws?

TRUMP: Well, the gun laws have nothing to do with this. This isn't guns. This is about mental illness. You're always going to have difficulties, no matter how tight you run it. Even if you had great education having to do with mental illness, you educate the community, still you're going to have people that slip through the cracks. And these people are more than slipping through the cracks.

Bernie Sanders: Gun legislation must work for both rural & urban Americans

SANDERS: Well, I think the people of Vermont know differently. They know in every single race that I have run, with the exception of one, the NRA and other gun lobbyists supported my opponent. I voted for banning assault weapons, doing away with the gun show loophole and fighting for instant background checks so that we make sure that guns do not fall in the hands of those people who should not have it. So, I have a strong record. But what we need to do is bridge this cultural divide between rural America and urban America and come up with some common sense legislation that accommodates everybody. What we really need is a national dialogue.