3.3.1 – Formal Sources of Presidential Power
3.3.3.2 – Limitations on Presidential Power
3.3.4 – Interpretations and Debates
On 17 June 2026, President Trump confirmed he had signed a framework agreement with Iran while visiting Versailles during the G7 summit, formally ending a war that began in late February. The text, read to reporters by administration officials, commits both sides to the immediate termination of military operations, sets a sixty-day window to negotiate a final deal, and reopens the Strait of Hormuz by lifting the American naval blockade. It also promises a reconstruction fund of up to $300 billion and an Iranian pledge not to develop nuclear weapons.
The agreement showcases the breadth of the president’s foreign policy authority. As commander-in-chief, Trump had directed the military campaign and the blockade; as head of state, he conducted the diplomacy personally, negotiating through Pakistani mediation and announcing terms directly. Crucially, the deal was structured as a memorandum of understanding rather than a treaty. This matters because Article II requires a two-thirds Senate vote to ratify treaties, whereas executive agreements need no such approval, allowing the president to commit the United States internationally without sharing the decision.
This structure tested the constitutional balance between the branches. Congress retains formal war powers, including the sole authority to declare war, and in mid-June the Senate considered a resolution to constrain further hostilities against Iran. It failed narrowly, by 47 votes to 48, with four Republicans joining nearly all Democrats. Lawmakers also invoked the Iran Nuclear Agreement Review Act of 2015, which requires nuclear agreements to be submitted for a thirty-day congressional review before sanctions are lifted, giving the legislature a procedural foothold even over an executive agreement.
This episode illustrates the long-running debate about the imperial presidency, the idea that modern presidents have accumulated power, particularly in foreign affairs, well beyond what the framers intended. The president could wage war, halt it, and negotiate its settlement largely without legislative consent, demonstrating how executive agreements have eroded the Senate’s treaty check. Yet the limits remained visible: a divided Senate scrutinised the conflict, statutory review mechanisms applied, and a final deal still depends on sanctions relief that Congress can influence. The Iran settlement therefore reveals a presidency that is dominant in foreign policy but never entirely unchecked.