Executive Agreements vs. Treaties: Presidential Choices in Foreign Policy

The U.S. Constitution provides two distinct mechanisms for the President to formalize international commitments: treaties, which require Senate ratification, and executive agreements, which the President concludes unilaterally or through congressional authorization. The choice between these instruments carries significant constitutional, political, and durability consequences. Understanding the structural differences between them is essential for analyzing how American foreign policy is made and how durable any given international commitment will be.

Definition and Scope

A treaty, as used in Article II of the U.S. Constitution, is a formal international agreement negotiated by the executive branch and submitted to the Senate for ratification. Under Article II, Section 2, the President "shall have Power, by and with the Advice and Consent of the Senate, to make Treaties, provided two thirds of the Senators present concur." Once ratified, a treaty becomes the supreme law of the land under the Supremacy Clause (Article VI).

An executive agreement is an international pact concluded by the President without submitting it to the Senate for a two-thirds vote. Executive agreements fall into three recognized categories:

1. Sole executive agreements — made on the basis of the President's independent constitutional authority alone, requiring no congressional action before or after.
2. Congressional-executive agreements — authorized by a prior act of Congress or later approved by a simple majority in both chambers, rather than a two-thirds Senate supermajority.
3. Article II treaty-implementing agreements — subsidiary agreements made pursuant to a previously ratified Article II treaty.

The practical volume difference is stark. According to the Congressional Research Service, the United States concluded more than 18,500 executive agreements between 1939 and 2017, compared to fewer than 1,100 treaties ratified during the same period. Executive agreements now constitute the overwhelming majority of U.S. international commitments.

How It Works

The treaty process under Article II proceeds through a defined sequence. The executive branch — typically through the State Department — negotiates the agreement with a foreign counterpart. The President then transmits the proposed treaty to the Senate, where the Senate Foreign Relations Committee holds hearings and markup. The full Senate then votes; a two-thirds affirmative vote is required for advice and consent. The President subsequently ratifies the treaty by exchanging instruments of ratification with the foreign party.

Executive agreements bypass the two-thirds threshold entirely. For congressional-executive agreements, both chambers of Congress may authorize the President to enter into categories of agreements — trade agreements under fast-track authority, for instance — or may approve specific agreements by simple majority after the fact. Sole executive agreements require no legislative involvement at any stage, relying instead on the President's powers as Commander in Chief, chief executive, or head of foreign relations.

The War Powers Resolution illustrates how Congress has attempted to define boundaries on unilateral executive action in related foreign-policy contexts — a parallel structural tension that also shapes the agreement/treaty choice.

Common Scenarios

Different types of international commitments have gravitational pull toward one instrument or the other:

• Arms control and disarmament — historically pursued as Article II treaties (e.g., the New Strategic Arms Reduction Treaty, New START, ratified by the Senate in 2010 with 71 votes) because of the magnitude of national security commitments involved.
• Trade agreements — frequently concluded as congressional-executive agreements (e.g., the United States–Mexico–Canada Agreement, implemented through the United Kingdom USMCA Implementation Act passed by simple majorities in both chambers).
• Military basing and status-of-forces — typically handled through sole executive agreements or congressional-executive agreements, based on the President's commander-in-chief authority.
• Climate and environmental commitments — the 2015 Paris Agreement was entered as a sole executive agreement, not submitted to the Senate, a choice that allowed for the U.S. withdrawal in 2017 and re-entry in 2021 without Senate action either time.

Decision Boundaries

The President's choice between a treaty and an executive agreement is not purely constitutional — it is simultaneously political, strategic, and durability-driven.

Constitutional constraints do not fully resolve the question. The Supreme Court has not established a definitive list of subjects that must proceed by Article II treaty. In Dames & Moore v. Regan, 453 U.S. 654 (1981), the Court upheld executive agreements settling Iranian assets claims, applying the framework from Youngstown Sheet & Tube Co. v. Sawyer to assess whether congressional acquiescence existed.

Durability is the sharpest practical distinction. An Article II treaty, once ratified, cannot be nullified by a successor President acting alone — withdrawal procedures are contested and have generated litigation (see Goldwater v. Carter, 444 U.S. 996 (1979)). A sole executive agreement, by contrast, can be terminated by a subsequent President through executive action, as the withdrawal from the Paris Agreement demonstrated. Congressional-executive agreements fall in between: a subsequent President may attempt withdrawal, but if Congress has incorporated the agreement into domestic law, legislative repeal is also required.

Political feasibility drives many choices. The two-thirds Senate threshold has defeated major treaty efforts — the Senate rejected U.S. membership in the League of Nations in 1920 and declined to ratify the Comprehensive Nuclear-Test-Ban Treaty in 1999. Presidents have responded by structuring commitments as executive agreements whenever constitutional authority supports that choice, accepting reduced durability in exchange for avoiding the supermajority obstacle.

The full architecture of presidential power in international affairs — including the treaty-making power and the commander-in-chief role — shapes which legal vehicle is available. Visitors seeking a broader orientation to how these tools fit within the presidency's constitutional design can consult the Presidential Authority resource index.