The future of the U.S. nuclear arsenal

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The U.S. Department of Defense Secretary announced 14 new ground-based interceptors will be added to its Alaska missile defense system, in light of increased threats from North Korea and Iran.

The United States is the premier nuclear power in the world. But the geopolitical landscape has radically transformed since the height of the Cold War. Meanwhile, our stockpile of ballistic missiles, nuclear submarines and large bombers is aging and in need of expensive upgrades and replacements.

 Steve Pifer, the former ambassador to Ukraine and director of the Brookings Arms Control Initiative, tells us what kind of nuclear arsenal makes sense for the for the 21st century.