The brain is a body part too; we just know less about it.

I was always amused that people were either skeptical or surprised that I would choose a Hillary Clinton as a secretary of state. To my mind, having somebody smart, tough, capable with her own stature, who could travel around the world and command the stage, was a huge asset.

When Americans are called on to innovate, that's what we do - whether it's making more fuel-efficient cars or more fuel-efficient appliances, or making sure that we are putting in place the kinds of equipment that prevents harm to the ozone layer and eliminates acid rain. At every one of these steps, there have been folks who have said it can't be done. There have been naysayers who said this is going to destroy jobs and destroy industry. And it doesn't happen because once we have a clear target to meet, we typically meet it. And we find the best ways to do it.

You can question somebody's views and their judgment without questioning their motives or patriotism.

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.

I was able to excite and engage people who previously hadn't been involved in politics, and part of the reason that I was able to be re-elected and stay relatively popular in the United States was because even when the economy was bad or we had problems, people sensed that I listened to them and I was on their side.

So Americans understand the costs of war. Yet as a country, we will never tolerate our security being threatened, nor stand idly by when our people have been killed. We will be relentless in defense of our citizens and our friends and allies. We will be true to the values that make us who we are.