Sixty-Six at Once: What International Law Says About America’s Mass Withdrawal from International Organisations

[Samay Jain is a legal researcher and scholar from Symbiosis Law School, Pune]

On 7 January 2026, the Trump administration published a Presidential Memorandum directing the withdrawal of the United States from sixty-six international organisations simultaneously, comprising 31 UN entities and 35 non-UN bodies, spanning climate, labour, migration, peacebuilding, and the rule of law. The list included the UNFCCC, the International Law Commission, the Global Counterterrorism Forum, and the Venice Commission of the Council of Europe. Secretary Rubio described them collectively as ‘anti-American, useless, or wasteful.’ Trump said in a subsequent interview that he did not ‘need international law.’

What makes this episode legally distinctive is not withdrawal itself, but withdrawal at scale. International law’s rules on exit were designed with individual withdrawals in mind. Nothing in international law formally prohibits a state from declaring simultaneous withdrawals from multiple treaties; under the VCLT framework, each withdrawal must nonetheless be implemented according to the governing provisions of its own instrument. What the January 7 memorandum exposes, therefore, is not a procedural illegality but a legal design challenge: how to manage sixty-six distinct withdrawal processes each with its own notice period, consent structure, and pending obligations through a single executive act. The episode therefore raises a broader question that extends beyond the United States: what international law can, and cannot, do when a powerful state exits international institutions en masse rather than in isolation.

The legal literature on treaty withdrawal is well developed. Helfer’s foundational analysis of exit clauses, Klabbers’s work on the interim obligations of withdrawing states under Article 18 of the Vienna Convention on the Law of Treaties (VCLT), and the extensive scholarship on US foreign relations law, most recently Biniaz and Galbraith writing in Just Security on the UNFCCC withdrawal, have each addressed specific dimensions of unilateral withdrawal. What the existing literature has not addressed is what happens when a State withdraws from sixty-six organisations at once, through a single executive memorandum, across treaties with radically different withdrawal provisions, different consent structures, and different pending obligations. The January 7 memorandum raises three international law questions that have not yet received adequate analytical attention each of which takes on heightened significance once withdrawal is understood as a systemic rather than isolated event: the legal design of the applicable withdrawal regimes and the differential difficulty of exit across the sixty-six bodies, the survival of pre-existing obligations, and the wider consequences for international institutional law.

Legal Design and Differentiated Withdrawal: One Memorandum, Sixty-Six Regimes

Treaty withdrawal is, as Helfer has shown, a legally structured act. The VCLT provides the default framework: where a treaty contains no withdrawal clause, Article 56 VCLT permits denunciation only if it can be established that the parties intended to admit such a possibility, or if a right of denunciation is implied by the nature of the treaty. The United States is not a party to the VCLT, a point with its own scholarly literature, given that the US has never resolved the constitutional allocation of authority between the Executive and Congress over treaty termination (Goldwater v. Carter left it unresolved). As the American Society of International Law noted even before the January memorandum, the US regards much of the VCLT as customary international law, binding upon it independently of ratification.

The January 7 memorandum makes no attempt to differentiate between the sixty-six bodies on the basis of their governing instruments. Some, including the UNFCCC, ratified by the Senate in 1992, have express withdrawal clauses with notice requirements. Article 25 of the UNFCCC requires one year’s written notice, and prohibits withdrawal within the first three years of ratification. Others are not treaties at all; they are voluntary partnerships, funding arrangements, or informal networks without formal membership rules. Treating these categories identically in a single executive act is analytically unsound: withdrawal from the UNFCCC is a categorically different legal act from ceasing to fund a voluntary programme. A brief comparison illustrates the variation. The ILO Constitution permits withdrawal only for states that have ceased to be members of the United Nations, and even then requires two years’ written notice. The Global Counterterrorism Forum, by contrast, was established by a joint ministerial statement in 2011 and carries no treaty status whatsoever: there is no instrument, no formal membership, and therefore no withdrawal rule to apply. Between the UNFCCC’s one-year notice requirement, the ILO’s two-year threshold, and the GCTF’s legal nullity, the memorandum’s silence on differentiation is not merely analytically unsound; it is legally incoherent.

The memorandum’s own hedge acknowledges this implicitly: ‘For UN entities, withdrawal means ceasing participation in or funding to those entities to the extent permitted by law.’ That qualification carries real legal weight. It concedes that domestic and international law may constrain the withdrawal, but the memorandum provides no analysis of where those constraints lie, or how they are to be resolved across sixty-six different instruments. Klabbers’s work on the object-and-purpose obligation under Article 18 VCLT suggests a further difficulty: even where a State has given valid notice of withdrawal, it remains obliged to refrain from acts that would defeat the treaty’s object and purpose pending the withdrawal’s entry into force. For a one-year notice treaty like the UNFCCC, that obligation runs until January 2027. Whether ceasing all financial contributions and participation during that window satisfies Article 18 goes unaddressed. Taken together, these legal design disparities illustrate a structural gap in international institutional law: detailed withdrawal rules exist for individual treaties, but no coordinating framework governs how those rules interact when multiple withdrawals are declared simultaneously. The memorandum’s failure to differentiate is not, in itself, a violation of any single rule; it is an exposure of an architectural gap that international law has not yet been required to fill.

Pending Obligations: What Withdrawal Does Not Erase

One aspect of withdrawal’s legal consequences is clear: it operates prospectively. It does not unwind what came before. As the ILC’s Articles on State Responsibility confirm, and as Article 70 VCLT makes explicit, withdrawal releases a State from any obligation to continue performing the treaty, but does not affect rights or obligations that arose under the treaty prior to its termination. Across sixty-six organisations, that principle leaves a substantial ledger of unresolved claims.

The most significant is financial. UN Secretary-General Guterres stated on 7 January that assessed contributions to UN budgets ‘are a legal obligation under the UN Charter for all Member States, including the United States.’ Assessed contributions are not voluntary payments; they are binding obligations arising from UN membership, allocated by the General Assembly under Article 17 of the UN Charter. The United States was assessed at approximately 22% of the regular UN budget and 27% of the peacekeeping budget for 2026–2027. The administration’s position that cessation of payment equals legal withdrawal conflates the prospective effect of withdrawal from specific UN programmes with the survival of obligations arising from continued UN membership itself. The US has not withdrawn from the UN. Its assessed contributions to the regular budget and to peacekeeping therefore remain legally owing, irrespective of the January memorandum.

A second category of pending obligations concerns ongoing proceedings before bodies the US has now vacated. The International Law Commission, from which the US has withdrawn, includes cases and working groups to which US experts were party. Withdrawal of state support does not automatically terminate those proceedings or relieve the US of any obligations incurred under instruments that gave rise to them. The same issue arises in relation to the Venice Commission, a body of the Council of Europe: US participation was as an observer, not a treaty member, which raises a pointed question: whether ‘withdrawal’ from a non-treaty body carries any legal content at all, or is purely political theatre. What these unresolved obligations reveal is not doctrinal uncertainty but institutional asymmetry. While international law clearly recognises the continued legal force of obligations accrued prior to withdrawal, it lacks mechanisms capable of translating that recognition into effective compliance when the withdrawing state is both financially indispensable and politically insulated from enforcement.

The Systemic Question: What Happens to International Institutions When Their Largest Funder Exits?

The scholarship on treaty withdrawal has generally been regime-specific. Helfer’s typology of exit strategies, Laurence Boisson de Chazournes’s work on institutional financing obligations, and the literature on US unilateralism in trade law each focus on particular institutions. None of it directly answers the question the January 7 memorandum poses: what happens to international institutional law when a state exits not one organisation, but sixty-six at once? In this sense, the January 7 memorandum functions less as an outlier than as a revealing case study, exposing assumptions embedded within international institutional law about participation, funding stability, and the behaviour of major powers.

Consider three consequences. The most immediate is financial. US contributions to the sixty-six bodies ranged from a few hundred thousand dollars to hundreds of millions. For bodies like the UN University, the Peacebuilding Fund, and the IDLO, the withdrawal is not merely a political signal. It may prove existential. International law has no general mechanism for compelling financial contributions from withdrawing states, and the ILC’s Articles on State Responsibility, while applicable in principle, offer no practical enforcement path against a permanent member of the Security Council.

The second consequence is the one that will linger longest: precedent. The IBA’s Environment and Health Committee has already noted that the US withdrawal ‘may force the world towards a fragmented landscape of bilateralism and climate clubs.’ The concern is not that other states will immediately follow; most lack the financial leverage to make withdrawal consequential. The concern is normative: if the world’s largest economy can withdraw from sixty-six organisations on sovereignty grounds without triggering any international legal consequence, the signal to any state considering selective non-compliance with institutional obligations is hard to misread. Alvarez’s scholarship on the constitutional dimension of international organisations is germane: organisations derive their authority partly from the expectation of participation by major powers. When that expectation is confounded at scale, institutional authority erodes whether or not any formal legal rule has been broken.

The third and most uncomfortable question is what international law can actually do. The UN Charter’s Article 19 provides that a Member which is in arrears in the payment of its financial contributions shall have no vote in the General Assembly if the amount in arrears equals or exceeds the contributions due for the preceding two full years. It is the sharpest tool available, and it was never invoked against the US even during the Reagan administration’s withholding of assessed contributions in the 1980s. The political reality is that international institutional law’s enforcement mechanisms were not designed for a scenario in which the state in breach is both a permanent Security Council member and the primary architect of the post-war institutional order. Scholarship offers several partial responses to this enforcement gap, though none is decisive. Helfer’s work on treaty exit points toward the value of graduated exit costs embedded in institutional design built-in transitional obligations, phased withdrawal of privileges, or financial penalties, as structural deterrents against abrupt mass exit. Alvarez’s constitutional framing of international organisations suggests a parallel lever: conditioning the benefits of major-contributor status on continued participation, so that disengagement carries automatic institutional costs beyond the loss of voting rights. Reform proposals have also targeted Article 19 of the UN Charter itself, with calls to lower the arrears threshold applicable to all members or to establish a standing financial accountability mechanism applicable to permanent Security Council members. None of these approaches commands consensus; taken together, however, they reflect a shared diagnosis that international institutional law’s vulnerability to mass exit is a design problem as much as an enforcement one, and the January 7 memorandum has made that problem harder to defer.

Three Implications for International Institutional Law

US disengagement from multilateralism has a long history in American foreign policy. Alvarez, Koskenniemi, and Bodansky have analysed it across different regimes. What January 7 adds is not the impulse but the scale which exposes the limits of international institutional law more starkly than prior episodes of US disengagement.

First, the legal character of withdrawal and the difficulty of achieving it, varies substantially across the sixty-six bodies and cannot be assessed in aggregate. For Senate-ratified treaties like the UNFCCC, the domestic constitutional question of whether the President can withdraw without Senate consent remains unresolved since Goldwater v. Carter. If a future administration seeks to re-accede to the UNFCCC, the Senate may insist on new consent, converting a political reversal into a constitutional negotiation. The legal uncertainty the January memorandum creates is asymmetric: it imposes costs on future administrations that the present one has chosen not to acknowledge.

Second, pending financial obligations, and assessed UN contributions in particular, survive withdrawal and remain legally owing. The administration’s apparent assumption that stopping payment is the legal equivalent of withdrawal conflates two distinct questions. Other member states, and the organisations themselves, have legal standing to pursue these obligations. Whether they choose to do so is a political question; that they can do so is a legal one, and the answer is yes.

Third, the mass withdrawal of January 7 exposes international institutional law at its most vulnerable: its dependence on voluntary compliance by powerful states. The existing scholarly literature has diagnosed this weakness in individual regimes. The January memorandum, by targeting sixty-six regimes at once, has converted a chronic vulnerability into an acute one. The lesson of January 7 is therefore not that international law is silent on withdrawal, but that its capacity to discipline withdrawal is contingent on assumptions about scale, reciprocity, and power that mass exits place under acute strain.Whether international law responds through adaptation, through revised financing mechanisms, reformed voting structures, or new institutional arrangements, or simply absorbs the blow, will say something important about the credibility of the system the United States spent much of the twentieth century constructing.