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.

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.

Ashton B. Carter contributes a chapter to McGraw-Hill's new volume on Weapons of Mass Destruction and Terrorism.

The Preventive Defense Project conducted a Washington WMD Workshop entitled "Iran Plan B Design" to collect the best thinking on the design of a plan for dealing with Iran's nuclear program should diplomacy fail and the Iranians continue on the path to nuclear capability.

Remarks by Ashton B. Carter at the 36th IFPA-Fletcher Conference on National Security Strategy and Policy, Washington, DC.

Remarks by Ashton B. Carter at the Conference on "Non-Proliferation of Weapons of Mass Destruction: Current Challenges and New Approaches," at Tufts University, Fletcher School of Law & Diplomacy.

Dr. Ashton B. Carter testifies before the 9/11 Public Discourse Project's hearings on "The 9/11 Commission Report: The Unfinished Agenda."

The fallacy in the Bush administration's appointment of a commission to study intelligence failures is that there is almost never such a thing as a pure intelligence failure. Intelligence failure is usually linked to policy failure.

Dr. Ashton B. Carter testifies before the Robb-Silberman Commission on the Intelligence Capabilities of the United States Regarding Weapons of Mass Destruction.