For more than two decades, I worked to strengthen military and diplomatic ties with China, alongside scores of other U.S. and allied officials, all of us sincere in our belief that China could be encouraged to join the principled, inclusive network that has served as the backbone of regional security since the end of World War II - and thus the Asian miracle. It is easy for me to imagine having used my time as Secretary of Defense to solidify those ties and bring China into closer partnership with the United States and the other participants in the network. 

Nineteen years ago, I was in Ukraine when the last nuclear warheads, orphaned during the Soviet Union’s breakup, rolled out of the country. As an assistant secretary of Defense at the time, I had worked with Washington colleagues and foreign counterparts to eliminate those nuclear weapons and thus one danger at the dawn of the post-Cold War world. Together — with bipartisan support in Congress led by Sens. Sam Nunn, a Democrat, and Richard Lugar, a Republican — we succeeded.

Today, the Iran deal provides the opportunity to address an even greater nuclear threat. Congress should support it because, once implemented, the deal will remove a critical source of risk and uncertainty in a vitally important but tumultuous region.

President Barack Obama announced Monday that he has nominated Dr. Ashton B. Carter to serve as Under Secretary of Defense for Acquisition, Technology and Logistics.

A Task Force sponsored by the National Security Initiative, a program of the Bipartisan Policy Center, released a ground-breaking report identifying the regional and global threats posed by a nuclear weapons-capable Iran and recommending a new, robust and comprehensive strategy designed to prevent Iran from acquiring nuclear weapons capability.

Dr. Ashton B. Carter and Ambassador Robert G. Joseph discuss recommendations stemming from recommendations in final report of the review they co-chaired of the Defense Threat Reduction Agency (DTRA) and other DOD efforts to counter weapons of mass destruction.

PDP Co-Director Ashton B. Carter testifies before the Senate Committee on Homeland Security and Governmental Affairs.

PDP Co-Director Ashton B. Carter and the Honorable Robert G. Joseph co-chaired a Review Panel on Future Directions for DTRA Missions and Capabilities to Combat Weapons of Mass Destruction (WMD).

This is the fifth in a series of videos on nuclear terrorism based on Graham Allison's book Nuclear Terrorism: The Ultimate Preventable Catastrophe. In this episode former Senator Sam Nunn, former Assistant Secretary of Defense Ashton B. Carter, and U.S. Undersecretary of State R. Nicholas Burns discuss nuclear proliferation and the bold action it will take to make sure that these weapons never end up in the hands of terrorists, criminals or rogue states.

This report of the International Security Advisory Board (ISAB) offers nineteen recommendations for discouraging a cascade of nuclear weapons states.