Treaty Power

Introduction

The treaty power is the constitutional authority to make international agreements on behalf of the United States. Article II, Section 2, Clause 2 provides that the President has the power to make treaties, provided two-thirds of the senators present concur. This power is shared between the executive and legislative branches: the President negotiates and ratifies treaties, while the Senate provides advice and consent. The treaty power has been a significant source of federal authority in foreign affairs, enabling the United States to enter into binding international commitments.

The Framers vested the treaty power in the President and Senate rather than the President alone or the entire Congress. This allocation reflects the need for secrecy and efficiency in negotiations (provided by the President) and the need for broad national consensus (provided by the Senate supermajority requirement).

The Treaty Process

The treaty process begins with presidential negotiation. The President, acting through the Department of State and diplomatic representatives, negotiates the terms of a treaty with foreign governments. The President has broad discretion in conducting negotiations, including deciding which countries to negotiate with, what subjects to address, and what terms to accept.

After negotiation, the President submits the treaty to the Senate for advice and consent. The Senate Foreign Relations Committee typically conducts hearings and recommends whether the Senate should consent. The Senate may consent to the treaty as submitted, consent with reservations, understandings, or declarations that interpret or limit U.S. obligations, or refuse consent.

If the Senate consents by two-thirds of senators present, the President may ratify the treaty, making it legally binding on the United States. Ratification involves the exchange or deposit of instruments of ratification with other parties. The President may decide not to ratify a treaty even after Senate consent, though this is rare.

Self-Executing vs. Non-Self-Executing Treaties

A critical distinction in treaty law is between self-executing and non-self-executing treaties. A self-executing treaty becomes domestic law upon ratification without requiring implementing legislation. A non-self-executing treaty requires Congress to enact implementing legislation before it has domestic legal effect.

The determination of whether a treaty is self-executing depends on the treaty’s text and the intent of the parties. Courts consider whether the treaty manifests an intent to provide a private right of action, whether the treaty addresses matters that are traditionally within Congress’s legislative authority, and whether implementing legislation is necessary to give the treaty domestic effect. The distinction is important because some treaties create rights enforceable in U.S. courts, while others depend on congressional implementation.

The Treaty Power and Federalism

Treaties can address matters that would otherwise be within state authority, raising questions about the treaty power’s relationship to federalism. In Missouri v. Holland (1920), the Supreme Court upheld the Migratory Bird Treaty Act, which implemented a treaty with Great Britain protecting migratory birds. The Court held that the treaty power extends to matters of national concern, even if those matters would be beyond Congress’s enumerated powers in the absence of a treaty.

The Missouri v. Holland decision established the broad principle that the treaty power is not limited by the same federalism constraints as Congress’s legislative powers. However, the Court has since suggested that treaties must comply with other constitutional limitations, including the Bill of Rights and structural limits on federal power. The Reserved Powers Clause of the Tenth Amendment does not limit the treaty power, but treaties cannot override specific constitutional prohibitions.

Executive Agreements

Not all international agreements are treaties subject to Senate advice and consent. The President may enter into executive agreements on the President’s own authority, without Senate approval. Executive agreements are binding international commitments under international law, though they may not supersede inconsistent federal statutes.

Executive agreements are based on the President’s constitutional authority in foreign affairs, prior congressional authorization, or statutory delegation. Congress has authorized executive agreements in numerous areas, including trade, defense, and environmental cooperation. The Case-Zablocki Act of 1972 requires the President to notify Congress of all executive agreements.

The use of executive agreements has expanded significantly, and the United States enters into far more executive agreements than treaties. The distinction between treaties and executive agreements has generated debate about the proper scope of presidential authority in foreign affairs and the role of the Senate in approving international commitments.

Termination and Suspension of Treaties

The Constitution does not specify the procedure for terminating treaties. The President has the authority to terminate treaties, consistent with international law and the terms of the treaty. Modern practice confirms that the President may unilaterally terminate treaties without Senate consent. Presidents have terminated treaties in various contexts, including defense alliances, trade agreements, and arms control treaties.

Congress may also authorize or direct treaty termination through legislation. The interaction between presidential and congressional termination authority has generated constitutional debate, particularly when the President terminates a treaty over congressional objections.

Treaties and the Supremacy Clause

Under Article VI, Clause 2, treaties made under the authority of the United States are part of the supreme law of the land, binding state judges notwithstanding contrary state law. This provision ensures that treaty obligations are enforceable in U.S. courts and that state law cannot override federal treaty commitments.

Treaties may also preempt inconsistent federal statutes under the last-in-time rule: if a treaty and a federal statute conflict, the one adopted later in time prevails. A subsequent federal statute can override a prior inconsistent treaty, and a subsequent treaty can override a prior inconsistent statute. This rule ensures that the United States can adapt its international obligations to changing circumstances.

The Treaty Power in Modern Practice

The treaty power has evolved significantly in modern practice. Treaties now address a wide range of subjects, including trade, human rights, environmental protection, arms control, and law enforcement cooperation. International organizations and multilateral treaty regimes have expanded the scope and complexity of treaty obligations.

Constitutional constraints on the treaty power include the Due Process Clause, the Equal Protection Clause, and other individual rights protections. Treaties may not abrogate constitutional rights. The Nondelegation Doctrine may limit Congress’s ability to delegate authority to international bodies, though courts have generally deferred to treaty arrangements.

Conclusion

The treaty power is a shared constitutional authority enabling the United States to enter into binding international commitments. The President negotiates and ratifies treaties with the advice and consent of two-thirds of the Senate. The distinction between treaties and executive agreements provides flexibility in the conduct of foreign relations, while the Supremacy Clause ensures that treaty obligations are enforceable as federal law. The treaty power continues to evolve in response to changing international conditions, reflecting the Constitution’s capacity to govern foreign affairs while preserving domestic constitutional constraints.