State visits are often an opportunity for the United States to reaffirm our ties and friendship with our closest partners around the world.

If we are not serious about facts and what's true and what's not. And particularly in an age of social media where so many people are getting their information in sound bites and snippets off their phones, if we can't discriminate between serious arguments and propaganda, then we have problems.

There's one issue that will define the contours of this century more dramatically than any other, and that is the urgent and growing threat of a changing climate.

For half of the world's population, roughly three billion people around the world living on less than two dollars a day, an election is at best a means, not an end; a starting point, not deliverance. These people are looking less for an "electocracy" than for the basic elements that for most of us define a decent life--food, shelter, electricity, basic health care, education for their children, and the ability to make their way through life without having to endure corruption, violence, or arbitrary power.

Working full-time should mean enough to support a family.

Now, the Iranian people are a great people, and Persian civilization is a great civilization. Iran has acted in ways that's not conducive to peace and prosperity in the region: their threats against Israel; their pursuit of a nuclear weapon which could potentially set off an arms race in the region that would make everybody less safe; their support of terrorist organizations in the past - none of these things have been helpful.

Our efforts will only be effective if ordinary citizens in other countries have confidence that the United States respects their privacy too. And the leaders of our close friends and allies deserve to know that if I want to learn what they think about an issue, I will pick up the phone and call them, rather than turning to surveillance.