The study of geography is about more than just memorizing places on a map. It's about understanding the complexity of our world, appreciating the diversity of cultures that exists across continents. And in the end, it's about using all that knowledge to help bridge divides and bring people together.

When any kind of military action is popular it's because either there's been a very clear, direct threat to us - 9/11 - or an administration uses various hooks to suggest that American interests were directly threatened - like in Panama or Grenada. And sometimes, those hooks are more persuasive than others, but typically, they're not put before Congress.

This counter-terrorism campaign will be waged through a steady, relentless effort to take out Isil wherever they exist, using our air power and our support for partner forces on the ground. This strategy of taking out terrorists who threaten us, while supporting partners on the front lines, is one that we have successfully pursued in Yemen and Somalia for years.

What I want to communicate is the fact that in all my travels throughout the Muslim world, what I've come to understand is that regardless of your faith - and America is a country of Muslims, Jews, Christians, non-believers - regardless of your faith, people all have certain common hopes and common dreams.

Donald Trump is like Hillary Clinton said, a man you can bait with a tweet is not a man you can trust with nuclear weapons. You can`t do it.

The science [of global warming] is beyond dispute... Delay is no longer an option. Denial is no longer an acceptable response

We cannot continue to rely only on our military in order to achieve the national security objectives that we've set. We've got to have a civilian national security force that's just as powerful, just as strong, just as well-funded.