NASA should not be developing its own proprietary version of capabilities it could purchase commercially at much lower cost, especially when we know the agency's bureaucratic tendencies will be to view the commercial versions as competitors to kill.

If Trump keeps learning, he could become a big asset. He will shatter the traditional patterns.

We're at the crossroads. Down one road is a European centralized bureaucratic socialist welfare system in which politicians and bureaucrats define the future. Down the other road is a proud, solid, reaffirmation of American exceptionalism.

I'm not a natural leader. I'm too intellectual; I'm too abstract; I think too much.

How this president handles the Middle East in general and wins in Iraq in particular will be probably the most important definition of his presidency.

If you take all the money we've spent at NASA since we landed on the moon and you had applied that money for incentives to the private sector, we would today probably have a permanent station on the moon, three or four permanent stations in space, a new generation of lift vehicles.