This means restoring our credibility with Iran. When we say an Iranian nuclear-weapons capability—and the regional instability that comes with it—is unacceptable, the ayatollahs must be made to believe us.

It means placing no daylight between the United States and Israel. And it means using the full spectrum of our soft power to encourage liberty and opportunity for those who have for too long known only corruption and oppression. The dignity of work and the ability to steer the course of their lives are the best alternatives to extremism.

But this Middle East policy will be undermined unless we restore the three sinews of our influence: our economic strength, our military strength and the strength of our values. That will require a very different set of policies from those President Obama is pursuing.

The 20th century became an American Century because we were steadfast in defense of freedom. We made the painful sacrifices necessary to defeat totalitarianism in all of its guises. To defend ourselves and our allies, we paid the price in treasure and in soldiers who never came home.