The bottom line on nuclear weapons is that when the president gives the order, it must be followed. There's about four minutes between the order being given and the people responsible for launching nuclear weapons to do so. And that's why 10 people who have had that awesome responsibility have come out and, in an unprecedented way, said they would not trust Donald Trump with the nuclear codes or to have his finger on the nuclear button.

Sometimes, in public life, people ask inappropriate, off-the-wall kinds of questions, don't they?

I have long been in favor of states and cities within states making up their own minds whether or not they want to permit fracking. I have been supportive of that.

Every call you make, every door you knock, every friend you register to vote could make the difference.

I think there were bad actors in the government and bad actors in the finance, mortgage, markets industries that need to be called out and held accountable.

As president, I'll set bold goals to combat climate change: generate enough renewable energy to power every home in America within 10 years and slash carbon pollution at home and around the world.

The first thing is we got to make sure we try to keep guns out of the wrong hands. And I want comprehensive background checks.