S-2130-119
Placed on Senate Legislative Calendar under General Orders. Calendar No. 235.
Sponsored by Pete Ricketts (R-NE)
What it does
The AUKUS Improvement Act of 2025 would make changes to the legislative and regulatory framework governing the AUKUS partnership — the trilateral security agreement between the United States, the United Kingdom, and Australia announced in 2021. Based on the bill's title, it would likely modify existing U.S. law to streamline, expand, or adjust the terms under which the three nations cooperate on defense technology, nuclear-powered submarine transfers, and advanced capabilities sharing.
Who benefits
U.S. defense contractors and technology firms involved in submarine construction and advanced defense systems; the U.S. Navy and Department of Defense, which would gain clearer legal authority for trilateral cooperation; Australia and the United Kingdom as partner nations receiving technology transfers; U.S. workers in shipbuilding and defense manufacturing industries; national security agencies overseeing Indo-Pacific strategy.
Who is hurt
U.S. domestic shipbuilding capacity could face strain if resources are redirected to partner nations; countries excluded from the partnership — particularly France, which lost a major submarine contract to AUKUS in 2021 — may face continued diplomatic and economic disadvantage; U.S. taxpayers who fund defense programs if costs increase; non-proliferation advocates concerned about sharing nuclear propulsion technology; other U.S. allies who may perceive a tiered alliance structure.
Supporters argue
Supporters would argue that strengthening the AUKUS framework is essential to maintaining a credible deterrent against growing military threats in the Indo-Pacific region. They would contend that closer defense integration among the U.S., UK, and Australia — three longstanding democratic allies — enhances collective security at a lower cost than unilateral action. Supporters would further argue that streamlining the legal and regulatory processes for technology sharing removes bureaucratic obstacles that slow cooperation, making the alliance more operationally effective. They would also assert that the bill helps preserve U.S. technological leadership by deepening partnerships with trusted allies, and that the economic benefits to American shipbuilders and defense manufacturers strengthen the domestic industrial base over the long term.
Opponents argue
Opponents would argue that the bill accelerates the transfer of sensitive nuclear propulsion technology in ways that could weaken global non-proliferation norms, setting a precedent that other nations may use to justify their own nuclear technology sharing arrangements. They would contend that the legislation shifts significant foreign and defense policy authority to the executive branch with insufficient congressional oversight, reducing accountability for decisions with major geopolitical consequences. Opponents would further argue that the bill strains an already overstretched U.S. shipbuilding industry, potentially delaying the Navy's own fleet modernization. They would also assert that deepening this exclusive trilateral arrangement risks alienating other key allies and partners whose cooperation is equally vital to Indo-Pacific stability.
Constitutional context
The bill implicates several constitutional provisions. The Treaty Clause (Art. II, Sec. 2) governs formal international agreements, though AUKUS was structured as an executive agreement rather than a Senate-ratified treaty, raising questions about the scope of congressional involvement. The Foreign Commerce Clause (Art. I, Sec. 8) and the War Powers framework are relevant to technology transfer and defense cooperation authorities. The Appointments and Commander-in-Chief Clauses bear on how implementation authority is delegated. Relevant cases include Medellin v. Texas (2008), which addressed the domestic legal force of international agreements, and Zivotofsky v. Kerry (2015), which clarified the executive's primacy in recognizing foreign sovereigns and conducting foreign policy. Trump v. Hawaii (2018) affirmed broad executive discretion in national security-related foreign policy decisions.
Checks and balances
The bill, as a legislative action, would assert congressional authority to shape the terms of the AUKUS partnership, potentially constraining or codifying executive discretion in how the agreement is implemented. Depending on its specific provisions, it could either expand executive flexibility by removing regulatory barriers to technology transfer, or limit it by imposing new reporting requirements, conditions, or timelines. The balance between the legislative and executive branches in managing this defense partnership is a central structural question the bill addresses.
Historical precedent
The Taiwan Relations Act of 1979 (P.L. 96-8) offers a comparable precedent, in which Congress codified the terms of a major security relationship after an executive-led diplomatic shift, establishing a statutory framework for arms sales and defense cooperation with Taiwan outside a formal treaty structure.