Congress’s attempt to curb President Donald Trump’s war powers in the U.S.-Israeli conflict against Iran is heading to a rare House test after the Senate rejected a Democratic effort to limit him, setting up Thursday’s vote in the chamber controlled by Republicans. The fight reflects a broader constitutional struggle: Article II names the president the “commander in chief of the Army and Navy,” while Article I gives Congress authority to declare war and oversight roles tied to military budgets.
The latest episode is expected to come after a long stretch in which lawmakers debated or tried to rein in presidential uses of force while presidents continued to rely on their commander-in-chief authority. As with earlier disputes over Trump’s military actions in other regions, the dispute over Iran turns on whether Congress can impose meaningful limits once the president decides to use force—an issue tied to how the War Powers Resolution works in practice.
Military historian Peter Mansoor, an Ohio State University professor and retired U.S. Army colonel, framed the debate as an imbalance between the branches. Mansoor said, “The Constitution gives war powers to two different branches of government,” and he argued that “the pendulum has swung towards the executive.” He added that “the framers meant for Congress to be the most powerful branch,” a view presented as part of Congress’s recurring effort to reclaim constitutional control.
Supporters of curbs say the House vote would be part of a constitutional course-correction. Democratic Sen. Tim Kaine, who sponsored Venezuela and Iran war powers resolutions, argued that the latest version—one that failed 47-53—would prevent a presidential “end-run around the Constitution.” Opponents have argued that presidents already operate with the broad latitude implied by their role as commander in chief.
Rand Paul, a Kentucky Republican, pressed a related point during Senate debate on Venezuela war powers. Paul mocked what he called an effort to deny that actions amounted to war, saying it was an “elaborate song and dance” and that it’s “an absurdity” to argue Trump’s actions were anything other than waging war. That argument sits at the center of the current Iran war-powers fight: whether congressional limits can apply when the president contends that military actions fall within executive authority without a formal declaration.
The Constitution, AP said, gives Congress power to “declare war,” as well as roles related to military budgets, while the presidency holds the commander-in-chief authority under Article II. Congress has not declared an official state of war since World War II, even as U.S. service members fought and died in full-scale conflicts in Korea, Vietnam, Iraq and Afghanistan, among other places. Instead of formal declarations, presidents and lawmakers have often relied on a patchwork of authorizations and after-the-fact endorsements tied to specific campaigns or funding.
The Senate and House fight also echoes debates that have played out across earlier wars. During the Korean War, for example, President Harry Truman engaged U.S. troops after a United Nations vote and without seeking lawmakers’ initial approval; Congress later approved the Defense Production Act as an after-the-fact endorsement that also remained a potential Pentagon tool. In Vietnam, lawmakers passed the Gulf of Tonkin Resolution in 1964, and AP reported that the resolution used language that Congress approved and supported the president’s commander-in-chief determination to repel attacks and prevent further aggression, before Congress repealed the measure in 1971.
In 1973, as the U.S. moved toward a Vietnam exit, Congress passed the War Powers Resolution intending to set guardrails for presidents by requiring certain communications with lawmakers and allowing Congress to hold votes setting parameters for military action. But AP reported that in later practice the War Powers Resolution has not served as a functional check on executive power. In 2020, for instance, a Democratic-controlled House adopted a measure intended to curtail Trump’s powers against Iran, but AP said the War Powers Resolution did not effectively limit executive action.
The broader pattern highlighted by Mansoor and others is that the U.S. has repeatedly ended up with presidents asserting broad wartime control while Congress often struggled to place effective end points on military action. AP described how presidents after Vietnam used their commander-in-chief role to send troops—sometimes providing notice to Congress under the War Powers Resolution while arguing for presidential authority in decisions—and how later Congresses also authorized force through other mechanisms after actions began.
AP also described post-9/11 decision-making as an example of Congress approving force through joint resolution rather than relying on formal declarations of war. President George W. Bush consulted with Congress after the Sept. 11 attacks, resulting in a joint resolution authorizing sweeping action focused initially on al-Qaida, with Congress asking for reports every 60 days. But in the years that followed, Congress authorized action against Iraq in 2002 without a defined end date that would have forced a clear pivot point, and AP said wars in Iraq and Afghanistan continued across multiple presidential terms without being declared.
In the current Iran war-powers dispute, the House vote Thursday would test whether lawmakers can use constitutional mechanisms—and the War Powers Resolution framework they built—to impose real constraints on a commander-in-chief decision. As the Senate’s vote rejected a Democratic limit that would have constrained Trump at least theoretically, the question now moves to whether Congress will attempt what observers say would be a rare step toward stronger legislative control during a continuing conflict.