The biggest challenge, I think, is always maintaining your moral compass.

America leads - not with bluster, but with persistent, steady resolve.

We can't expect to solve problems if all we do is tear each other down. You can disagree with a certain policy without demonizing the person who espouses it.

To restore America's competitiveness, we must recruit a new generation of science and technology leaders by investing in diversity.

Cool, logical, big-eared and level-headed, the center of Star Trek's optimistic, inclusive vision of humanity's future. I loved Spock.

I do not talk to the FBI directors about pending investigations [on Hillary Clinton].

We've persevered because of a belief we share with the Iraqi people - a belief that out of the ashes of war, a new beginning could be born in this cradle of civilization. Through this remarkable chapter in the history of the United States and Iraq, we have met our responsibility. Now, it's time to turn the page.