The United States can bolster international norms of peace and stability by ratifying the Comprehensive Test Ban Treaty.
Preventing the spread of nuclear weapons remains a top security challenge for the world. A global ban on nuclear weapons testing is a step towards achieving that goal. However, the CTBT cannot enter into force until all nations with nuclear weapons and nations capable of building them ratify the treaty. To date, China, Egypt, India, Iran, Israel, North Korea, Pakistan and the United States haven't ratified the CTBT.
U.S. ratification could have a domino effect that would bring the world closer to a permanent ban on nuclear testing; China has already publicly stated they will ratify soon after the U.S.