Donald Trump is a person who has been very cavalier, even casual about the use of nuclear weapons.

I don't think most Americans understand that, for certain very wealthy people, our federal income tax system is a subsidy system that makes them richer.

I think people do want change, but we want to make sure that the change will actually help people. And that's why I reject the change agenda that Donald Trump has.

I don`t control the schedule of the networks. We have three of our debates that are on network television, and those are on Saturday nights. We have three other debates that are during the week. And unfortunately, broadcast network programming is less flexible than cable network programming.

America can only live up to its potential when each and every American has the chance to live up to your potential, too.

I don't think any of us have the answers to everything. There's no human being on earth who fits that category. So why wouldn't you ask for help? Why wouldn't you run ideas by people that you respect? Too many young people cast around trying to figure out what the answer is themselves, because they're afraid to come back and say, "I'm not sure I understood you," or "Could you give me a little more information about what you need?" Just do that. It saves you time, it saves your boss's or mentor's time. And it's a great lesson to learn.

The need for peace in Northern Ireland goes well beyond political stability. It now speaks to regional Europe and even global stability.