The American people are pretty impressive in their ability to keep after something if they think it is doable.

I think one has to say it's not just simply a matter of capturing people and holding them accountable, but removing the sanctuaries, removing the support systems...

I've met quite a few dictators up close and personal in my life.

The only way you can be comfortable about Donald Trump's foreign policy, is to think he doesn't really mean anything he says.

Every math curriculum in the world is based on the idea of hand-calculating, and most of what you're teaching is how to calculate. And I think the resistance to this is very variable.

History is just littered with problems that were solved that were supposed to be impossible.

Poles understand perhaps better than anyone the consequences of making toothless warnings to brutal tyrants and terrorist regimes.