I invigorated the grassroots in the Republican Party as well as the Democratic Party.

On behalf of the American people, just let me say that we are proud to count Greece as one of our closest allies and one of our greatest friends.

It wasn't until about a year, year and a half in where I began to realize that the Pentagon and our national-security apparatus and the CIA were all getting too comfortable with the technology as a tool to fight terrorism, and not being mindful enough about how that technology is being used and the dangers of a form of warfare that is so detached from what is actually happening on the ground. And so we initiated this big process to try to get it in a box.

At least Romney and McCain, they respect the rule of law. At least Romney and McCain, they understand their limitations.

I think that Mr. Snowden raised some legitimate concerns. How he did it was something that did not follow the procedures and practices of our intelligence community. If everybody took the approach that I make my own decisions about these issues, then it would be very hard to have an organized government or any kind of national security system.

Leadership isn't just legislation, that it's a matter of persuading people and giving them confidence, and bringing them together and setting a tone.

As a nuclear power - as the only nuclear power to have used a nuclear weapon - the United States has a moral responsibility to act.