Mankind is drawn to the heavens for the same reason we were once drawn into unknown lands and across the open sea. We choose to explore space because doing so improves our lives, and lifts our national spirit. So let us continue the journey.

I am a war president.

We may discover resources on the moon or Mars that will boggle the imagination, that will test our limits to dream. And the fascination generated by further exploration will inspire our young people to study math, and science, and engineering and create a new generation of innovators and pioneers.

This notion that the United States is getting ready to attack Iran is simply ridiculous. And having said that, all options are on the table

Embryonic stem-cell research requires the destruction of life to create a stem cell. That's why I think we've got to be very careful in balancing the ethics and the science.

The presidency is a serious job that requires sound judgment and good ideas, and there's no doubt in my mind that Jeb Bush has the experience and the character to be a great president.

[My father] taught me (at least he showed me) a dignified way to be a former president is that once you're off the stage, you're off the stage.