Why US Military Action Against Iran Defies Both International and Constitutional Law
The Unlawful War
In the shadowed corridors of power, decisions about war are often framed as matters of strategy, deterrence, or necessity. But when the United States, alongside Israel, launches military strikes against Iran, the question is not merely tactical—it is foundational. Under the bedrock principles of international law and the explicit architecture of the United States Constitution, such action stands on legally untenable ground.
The United Nations Charter, ratified by the United States in 1945, establishes a clear and enduring rule: the threat or use of force against the territorial integrity or political independence of any state is prohibited. This is not a flexible guideline. It is the cornerstone of the post-1945 international system, designed to prevent the very cycles of aggression that devastated the twentieth century.
There are only two recognized exceptions to this prohibition. A state may use force in self-defense if an armed attack occurs against it—a right that is inherent but must be immediate, necessary, and proportional. Alternatively, the UN Security Council may authorize collective military action to address threats to international peace and security. Neither condition has been met in the case of US-led strikes against Iran.
Legal experts commissioned by the German parliament have concluded that attacks on Iran violate the UN Charter's prohibition on the use of force. They find no credible basis for a self-defense claim, as no armed attack by Iran against the United States has occurred that would justify a military response under international law. Nor has the Security Council passed any resolution authorizing force against Iran. Without one of these narrow exceptions, the use of force is, by the prevailing opinion of international legal scholars, unlawful.
The implications extend beyond the immediate actors. Nations that facilitate such operations—by allowing their territory to be used for launching attacks—risk complicity in violations of international law. The German parliamentary analysis explicitly warns that the use of US bases on German soil, such as Ramstein Air Base, for operations against Iran could constitute "indirect use of force" and raise questions of state responsibility. This is not theoretical. Precedent exists: earlier analyses regarding Russia's war in Ukraine determined that merely making territory available for offensive operations could amount to aiding and abetting unlawful force.
The Constitutional Breach: War Powers Belong to Congress
Within the United States, the legal infirmity is equally stark. The Constitution draws a deliberate line between the branches of government when it comes to war. Article I, Section 8 vests in Congress—not the President—the power to declare war, to grant letters of marque and reprisal, and to make rules concerning captures on land and water. This was no oversight. The Framers, wary of concentrated executive power, placed the momentous decision to enter armed conflict in the hands of the representative body.
In 1973, Congress reinforced this constitutional design through the War Powers Resolution. Enacted over a presidential veto, the law requires the President to consult with Congress before introducing US forces into hostilities, to report to Congress within 48 hours of doing so, and to withdraw forces within 60 days unless Congress has declared war or provided specific statutory authorization. The purpose was clear: to prevent precisely the scenario of unilateral executive war-making.
No such authorization exists for military action against Iran. Congress has not declared war. It has not passed a resolution approving sustained hostilities. Yet strikes proceed. This pattern—of presidents invoking broad interpretations of self-defense, imminent threat, or inherent authority to bypass the legislative branch—represents a sustained erosion of constitutional safeguards. Each instance normalizes the next, shifting the balance of power away from the people's representatives and toward the executive.
When powerful states act outside the law, the damage is not confined to the immediate conflict. The international legal order depends on consistent adherence to its core rules. Selective enforcement, or worse, open disregard by those who helped create the system, invites imitation and accelerates its unraveling. If the prohibition on the use of force becomes optional for some, it ceases to function as a restraint for any.
The path forward requires clarity, not convenience. For the United States, honoring its constitutional commitments means engaging Congress before committing forces to hostilities. For the international community, upholding the UN Charter means refusing to legitimize uses of force that lack legal justification. And for allied nations hosting US military assets, it means confronting difficult questions about complicity when those assets are used for operations of doubtful legality.
War is sometimes necessary. But necessity does not create legality. When military action proceeds without the authorization required by international law or the Constitution, it does not merely break rules—it undermines the very frameworks designed to restrain power, protect sovereignty, and preserve peace. In the case of US strikes against Iran, the legal verdict is clear. The question that remains is whether those in power will choose to heed it.
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