You cannot tell the enemy you're going to leave and expect the enemy to not - and expect to succeed. I mean, that's just a fundamental of warfare.

When we're talking about a trillion dollars of taxpayer money, "trust me" just isn't good enough.

I think [social media] is fundamentally restructuring the whole nature of information and how it's expressed in America.

I spent several years in a North Vietnamese prison camp in the dark, fed with scraps. Do you think I want to do that all over again as vice president of the United States? The vice president has two duties. One is to break a tie in case of a tie vote in the United States Senate... The other is to inquire daily as to the health of the president. Neither one of those are very challenging as compared to being able to live for a good part of the time in the state of Arizona.

Thousands of Americans have given their lives in Afghanistan and Iraq upholding their oaths and defending this nation. Chelsea Manning broke her oath and made it more likely that others would join the ranks of her fallen comrades. Her prison sentence may end in a few months' [time], but her dishonor will last forever.

The day that the leadership of the military comes to me and says, "Senator, we ought to change the policy," then I think we ought to consider seriously changing it.

I think that Joe Biden is qualified in many respects. But I do point out that he's been wrong on many foreign policy and national security issues, which is supposed to be his strength.