Can the President withdraw from NATO without congressional approval?

What withdrawing from NATO would legally mean

Article 13 of the North Atlantic Treaty says a member may cease to be a party after giving notice and observing the treaty’s waiting period. That provision makes an exit operationally possible under international law, because it sets the mechanism and timing for a state to stop being a party to NATO, rather than leaving the decision about domestic authorization to any single member state alone North Atlantic Treaty (Article 13).

In international law terms, withdrawal is a state-to-treaty act: a sovereign member notifies the treaty depositary and waits the prescribed period for the termination to become effective. That process governs a state’s obligations to other treaty parties, but it does not by itself settle how a member state must act under its own domestic law to effect the withdrawal.

For the United States those two layers matter. The treaty’s text controls NATO’s internal rules about membership, while the U.S. Constitution and domestic statutes control how the United States makes and implements international commitments at home. Article 13 makes an operational NATO withdrawal possible, but it does not answer the domestic question of who in the U.S. government has the authority to give that notice.

How a U.S. President would start and carry out a NATO withdrawal in practice

Practically, the mechanics begin with formal notification under Article 13. The treaty requires a member to deliver notice and then observe the waiting period before withdrawal is effective, and in U.S. practice the State Department would ordinarily handle the diplomatic steps and communicate the notice to NATO and to other parties North Atlantic Treaty (Article 13).

Within the executive branch, the State Department’s Office of the Legal Adviser and other officials would coordinate the drafting and transmission of formal notice, advise on timing and consequences, and work with the White House to manage immediate diplomatic and military questions. The Department of State has documented executive-branch practice and internal guidance for how termination or withdrawal from international agreements is processed and communicated Termination and Withdrawal from International Agreements – State Department guidance.

Those diplomatic and operational steps are distinct from domestic legal authority. Even after a notice is sent, domestic questions would arise about whether additional domestic procedures were required for the United States to recognize and implement the change. The treaty mechanics govern relations between NATO members, while U.S. constitutional and statutory law governs internal authorization and implementation.

Congress, the War Powers Act, and the constitutional question of withdrawal

The Constitution gives the President the role of making treaties with the Senate’s advice and consent, but it is silent about how to end a treaty once formed. Article II, Section 2 assigns treaty-making and leaves the withdrawal procedure unaddressed, which has produced the core legal debate about whether withdrawal requires further congressional action or approval U.S. Constitution – Article II, Section 2.

The War Powers Resolution, sometimes called the War Powers Act, is often cited in debates about congressional authority over military commitments and related executive actions. The War Powers Resolution focuses on the President’s power to introduce U.S. armed forces into hostilities and on reporting and consultation with Congress, and scholars and lawmakers sometimes refer to it when arguing about congressional roles in international commitments related to military action, though it does not directly prescribe treaty withdrawal procedures War Powers Resolution text and history. See a Lawfare discussion on related constitutional issues Constitutional Issues Relating to the NATO Support Act.

Scholarly and legal analyses emphasize that Congress has other tools that can shape or respond to withdrawal, including reporting rules, oversight hearings, and control of appropriations. Congressional Research Service work and related analyses treat these tools as meaningful constraints or responses, while also noting there is no single statute that uniformly authorizes Congress to block an executive termination of every treaty CRS legal background and historical practice.

In short, the constitutional text sets the treaty-making process, but the silence on withdrawal has left the question of domestic authority unresolved. The War Powers Resolution factors into broader debates about congressional oversight and responses to military commitments, but it is not a stand-alone rule that settles the treaty-withdrawal question across the board.

What the courts have said so far: Goldwater v. Carter and judicial uncertainty

Goldwater v. Carter was a 1979 dispute about a president’s termination of a treaty action where the Supreme Court ultimately did not decide the merits and instead emphasized political-question concerns. Because the Court avoided a merits ruling, Goldwater left unsettled whether presidents may unilaterally withdraw from treaties under domestic law Goldwater v. Carter.

The main consequence of that non-decision is a persistent judicial uncertainty: courts have limited precedent directly endorsing or rejecting unilateral presidential withdrawal in the domestic-law sense. That has led to divergent scholarly views and left the question open for future litigation. See scholarly treatments of Goldwater for further context Goldwater v. Carter – Project MUSE.

Political-question doctrine, which the Court invoked in Goldwater, can make judges reluctant to decide high-stakes disputes between the political branches over foreign affairs and treaty termination. If courts deem an issue primarily committed to the political branches, they may decline to review it, meaning judicial resolution is an uncertain pathway for settling a withdrawal dispute.

Congressional tools, oversight, and possible responses

Congress can deploy several concrete tools to respond to or attempt to limit an executive decision to withdraw from NATO. These include requiring reports and briefings, holding oversight hearings that publicly scrutinize the executive action, passing statutes that clarify domestic procedures, and using appropriations and spending restrictions to affect funding for related activities or commitments, as discussed in a recent CRS analysis Separation of Powers and NATO Withdrawal CRS legal background and historical practice.

Appropriations are especially powerful in practice because Congress controls federal funding. Lawmakers could attempt to use funding riders or broader appropriations language to restrict certain actions or to limit resources needed to carry out aspects of a withdrawal, though such steps could prompt their own constitutional disputes and would raise questions about the scope of congressional power.

Reporting requirements and oversight hearings serve both informational and political purposes. Requiring the executive to explain the legal and factual basis for a withdrawal creates public records that can shape legislative and judicial responses. Those mechanisms do not necessarily provide a direct veto on withdrawal, but they give Congress levers to influence timing, implementation, and public opinion.

Likely legal arguments and litigation pathways if a President tried to withdraw from NATO

The executive branch would likely advance arguments grounded in the President’s foreign-affairs authority and historical practice of terminating or modifying international agreements without fresh Senate approval. Such arguments emphasize the President’s role in conducting diplomacy and the fact that past administrations have sometimes acted unilaterally on international agreements as part of their legal posture CRS legal background and historical practice.

Opponents would likely argue that the Constitution’s treaty clause contemplates a shared role between the President and the Senate and that terminating a treaty with broad security implications should require some form of congressional involvement, whether through statute, resolution, or funding conditions. They would point to the Constitution’s text and to Congress’s legislative powers to justify those claims U.S. Constitution – Article II, Section 2.

Litigation could come from members of Congress, states, or private parties claiming particular legal harms. Courts would first consider standing and justiciability, and political-question doctrine could limit judicial intervention. If a court took the case on the merits, the arguments would turn on constitutional text, historical practice, and statutory authority, and those questions are currently viewed as unresolved by many legal scholars and analysts CRS legal background and historical practice.

Historical examples and executive-branch practice on treaty termination

The State Department’s Office of the Legal Adviser documents how the executive typically handles termination and withdrawal matters, including internal steps and diplomatic notifications. Those materials explain how the executive thinks through timing, notice, and communication with other parties when an administration decides to alter an agreement Termination and Withdrawal from International Agreements – State Department guidance.

Because past practice is mixed, historical examples do not provide a single, bright-line rule. Instead they offer evidence that presidents have sometimes acted without congressional approval, and that such practice has been a significant part of the argument that the executive has authority to manage foreign relations, even in areas tied to treaties.

Practical takeaways: what a President’s NATO withdrawal would likely trigger

Operationally, Article 13 means a NATO exit is possible once formal notice is given and the waiting period passes. At the same time, an attempted U.S. withdrawal would likely produce immediate diplomatic fallout, rapid congressional responses, and uncertain litigation prospects, making the overall effect highly contingent on politics and timing North Atlantic Treaty (Article 13).

Near-term indicators to monitor include whether formal notice is filed under the treaty, how Congress frames its response in resolutions or appropriations language, whether hearings are scheduled to probe legal and strategic rationales, and whether private parties or legislators file lawsuits challenging the action. Those steps would shape both political pressure and potential judicial review CRS legal background and historical practice.

In addition, the War Powers Act can play a role in related debates about military commitments and the use of force, and lawmakers may invoke it in hearings or legislation to clarify limits on executive action tied to military obligations, even if it does not directly resolve the treaty-withdrawal question War Powers Resolution text and history.

For readers watching developments, the most concrete clues include official State Department statements about notice and timing, congressional committee activity and appropriations language, and any litigation filings that test standing and justiciability. Each of those steps would shape the practical ability of the United States to complete a withdrawal and the timeline on which that process unfolded.