The HALT Act of 2025 is a bill designed to reduce nuclear weapons threats to the United States and the world by pursuing international agreements to freeze, limit, and eventually eliminate nuclear arsenals. The bill establishes that it's U.S. policy to lead negotiations with other nuclear-armed countries—including Russia, China, the United Kingdom, and France—to create binding agreements that would stop the testing, production, and deployment of new nuclear weapons. The bill specifically prohibits the U.S. from conducting any nuclear weapons tests that produce an explosion unless the President submits a detailed report to Congress explaining why the test is necessary and Congress approves it through a joint resolution. This effectively maintains the current moratorium on nuclear testing while keeping the door open only if there's a genuine national security emergency that both the President and Congress agree warrants testing. The bill also calls on the President to push for Senate ratification of the Comprehensive Nuclear Test Ban Treaty and to work through the United Nations and other international bodies to negotiate agreements on verifiable limits for all types of nuclear weapons, including newer technologies like hypersonic missiles. The underlying goal is to build on decades of bipartisan U.S. efforts to reduce nuclear weapons by creating a modern "global nuclear freeze" that would prevent any country from expanding or improving its nuclear arsenal.