Who Decides When America's Iran War Ends?

The bombs are already falling. The question now is who gets to decide when—and how—they stop.

The Trump administration launched an air campaign against Iran's nuclear and missile infrastructure without seeking prior congressional approval. Weeks in, the operation has already cost an estimated $30 billion. The Pentagon is reportedly preparing a supplemental budget request that could reach $200 billion. And yet Congress, the branch of government constitutionally tasked with declaring war, has so far managed only competing resolutions that largely cancel each other out.

What Congress Has Done—and Why It Isn't Enough

House and Senate Democrats introduced resolutions calling on Trump to pause the bombing campaign until Congress can hold a proper debate. The instinct is constitutionally sound: in a democracy, a major military operation of this scale should carry the explicit backing of the people's elected representatives. But Michael O'Hanlon, Philip H. Knight Chair in Defense and Strategy at the Brookings Institution, argues that these resolutions amount to little more than a punt. They demand a pause without offering any vision of what should come next. They relitigate the decision to go to war rather than shape the war's trajectory going forward.

Republican Senator Lisa Murkowski offered a separate resolution—one that at least calls for consultation and reporting to Congress. But it stops well short of imposing any real constraints on the administration's freedom of action.

O'Hanlon's prescription is more surgical. Congress should retroactively authorize the air campaign as it has unfolded so far—including strikes on Iran's nuclear infrastructure—while explicitly prohibiting a large-scale ground invasion and ruling out an open-ended air campaign aimed at sparking regime change. Crucially, he proposes tying this resolution to the Pentagon's budget request: rather than approving the full $200 billion (which would implicitly greenlight indefinite escalation), Congress should authorize $60 to $75 billion—enough to sustain current operations through April and into May. After that, Trump would have to return to Capitol Hill with a new justification if he wants to keep going.

Why the Ground War Question Is the Real One

Trump has publicly floated the goal of regime change in Tehran. That's where the strategic logic gets precarious.

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Historically, the United States has achieved regime change in exactly three ways: by putting troops on the ground (Panama, 1989; Iraq, 2003), by partnering with a powerful indigenous fighting force (Afghanistan's Northern Alliance, 2001), or by destroying an adversary's society through years of comprehensive air and naval power (Japan, World War II). None of those conditions exist in Iran today.

Iran has a population of nearly 100 million people—three times that of Iraq or Afghanistan at the time of U.S. intervention. The math of a ground war is not subtle. Thousands of additional U.S. troops have already moved into the region, and the administration's stated ambitions keep expanding. A congressional resolution that draws a clear line against an invasion force wouldn't strip Trump of meaningful options—special operations raids, seizure of Kharg Island, or establishing a coastal presence near the Strait of Hormuz would all remain on the table. But it would prevent the kind of open-ended escalation that has historically defined American military quagmires.

The 1973 War Powers Resolution gives a president 60 to 90 days to conduct major military operations without congressional approval. That clock is ticking. Congress is not operating from a position of leisure.

Three Ways to Read This Moment

For Trump's supporters, the air campaign represents decisive action on a problem that diplomacy failed to solve for more than two decades. The Obama-era nuclear deal (JCPOA) bought time but didn't stop Iran's nuclear advancement. From this view, Trump is doing what his predecessors—Bush, Obama, Biden—refused to do: actually force the issue.

For critics, the constitutional concern is the story. The legitimacy of the goal doesn't sanitize the process. Wars begun without congressional authorization set precedents that outlast any single administration. The next president—of either party—inherits that expanded executive power.

For the international community, particularly China and Russia, the conflict offers a ready-made narrative about American unilateralism. Europe faces a more immediate problem: the Strait of Hormuz carries roughly 20% of global oil exports, and a prolonged conflict risks an energy crisis with direct economic consequences for EU member states already managing fragile recoveries.

What the Budget Fight Actually Means

The supplemental budget request is where congressional leverage becomes concrete. Approving $200 billion in full is effectively a blank check—a signal that Congress accepts whatever the administration decides to do next, including escalation. Approving a fraction of that, tied to a resolution with defined parameters, is the legislature doing its actual job: not micromanaging battlefield tactics, but setting the broad boundaries within which the executive operates.

O'Hanlon's framework would allow Trump to claim a genuine military success—the serious degradation of Iran's nuclear and missile capabilities—without committing the United States to an unwinnable ground war in one of the world's most complex countries. It would also preserve American military readiness for other potential flashpoints: Taiwan, Eastern Europe, the Korean Peninsula.