The Hastening Arms Limitations Talks Act of 2025, or HALT Act, establishes a United States policy to reduce and eliminate threats from nuclear weapons. It calls for the U.S. to lead international negotiations for a 21st-century global nuclear freeze movement, building on past arms control efforts. The goal is to secure multilateral agreements on arms control, disarmament, and risk reduction with all nuclear-weapon states. These agreements should include resuming New START inspections, negotiating follow-on treaties with lower limits, and establishing a verifiable freeze on nuclear weapons testing, production, and deployment. The policy also advocates for numerical ceilings on P5 nuclear warheads and delivery systems, and commitments to "no first use" policies or transparency. Further provisions seek agreements on protecting nuclear command and control infrastructure, limiting hypersonic missiles, and ensuring transparency of active nuclear arsenals. Additionally, the bill directs the U.S. to rejuvenate efforts for a verifiable Fissile Material Treaty, convene head-of-state summits on nuclear disarmament, and seek Senate ratification of the Comprehensive Nuclear-Test-Ban Treaty (CTBT). It also mandates that the U.S. refrain from developing new nuclear warhead designs that could necessitate renewed testing and seek reciprocal commitments from other nuclear powers. Finally, the Act prohibits the use of funds for any explosive nuclear weapons test producing a yield, unless the President submits a detailed report and Congress passes a joint resolution of approval, while allowing zero-yield stockpile stewardship activities.