Cutting the deficit by gutting our investments in innovation and education is like lightening an overloaded airplane by removing its engine. It may make you feel like you're flying high at first, but it won't take long before you feel the impact.

With respect to the Internet and emails, this does not apply to U.S. citizens and it does not apply to people living in the United States.

People of Berlin - people of the world - this is our moment. This is our time.

When what you’re doing doesn’t work for 50 years, it’s time to try something new.

We created a whole lot of millionaires to boot. Businesses did just fine. And you know there are plenty of patriotic, successful Americans all across the country -- I meet them every day -- who'd be willing to make this contribution again because they understand there is such a thing as the common good. They understand that we're in this thing together.

I think when you're governing, it will become increasingly apparent that if you were to just eliminate trade deals with Mexico, for example, well, you've got a global supply chain. The parts that are allowing auto plants that were about to shut down to now employ double shifts is because they're bringing in some of those parts to assemble out of Mexico. And so it's not as simple as it might have seemed.

Over more than a decade, Iran had moved ahead with its nuclear program. And before the deal, it had installed nearly 20,000 centrifuges that could enrich uranium for a nuclear bomb.