I will take responsibility for any impression or anything I've ever done that people have legitimate questions about. But I think that it's fair to say there's been a concerted effort to convince people like that young man of something, nobody's quite sure what, but of something.

Historically, it is important to try to understand your adversary in order to figure out how they are thinking, what they will be doing, how they will react.

Don't worry about things, that you can do better next time. Don't worry about stuff you can't control.

I believe in America, and I still do.

Today, there's more that can and should be done that really has to come from the industry itself, and how we can strengthen our economy, create more jobs at a time where that's increasingly challenging, to get back to Teddy Roosevelt's square deal. And I really believe that America and all of you are up to that job.

I never respond to Donald Trump's personal insults about me. I could care less what he says about me. I'm going to respond when he calls a judge unqualified because of his Mexican heritage, or mocks a reporter with a disability, or says demeaning things about women. And the list goes on.

I think a revolution transitioning from fossil fuels to clean, renewable energy - somebody's going to be the 21st-century clean-energy superpower.