Three days after 9/11

Congress passed the Authorization for Use of Military Force on September 14, 2001 — three days after the September 11 attacks. The vote was 420-1 in the House and 98-0 in the Senate. The text was 60 words long.

The authorization permitted the President to use “all necessary and appropriate force against those nations, organizations, or persons he determines planned, authorized, committed, or aided the terrorist attacks that occurred on September 11, 2001, or harbored such organizations or persons.”

The substance of the authorization was the response to a specific attack by a specific organization (al Qaeda) operating with the support of a specific government (the Taliban regime in Afghanistan). The text was framed accordingly: against those responsible, and against those who harbored them.

Twenty-four years later, four administrations have used the 2001 AUMF to authorize military operations against:

• al Qaeda in Iraq, Yemen, Pakistan, Somalia, the Philippines
• The Islamic State (ISIS) — an organization that did not exist on September 11, 2001
• Al-Shabaab in Somalia
• Al Qaeda in the Arabian Peninsula
• Various successor and affiliate organizations across more than a dozen countries

Most of these targets had no operational connection to the 9/11 attacks. Many did not exist when the AUMF was passed. The “harbored” language has been read to extend to governments and organizations whose connection to the original target organizations is, in some cases, attenuated to the point of disappearance.

The 2002 and 1991 AUMFs — repealed in December 2025

The Authorization for Use of Military Force Against Iraq Resolution of 2002 was a separate statute, authorizing force against the government of Iraq under Saddam Hussein. The Iraq War operations it authorized ended in 2011 (in a formal sense — US forces returned in 2014 to operate against ISIS, but those operations have been conducted under the 2001 AUMF).

The Authorization for Use of Military Force Against Iraq Resolution of 1991 — for the Gulf War — was older still. The Gulf War operations it authorized ended that same year.

Both statutes outlived their conflicts by decades, and both remained technically in force long after the operations they authorized concluded. Each was cited periodically in legal arguments to support military operations whose primary authority was contested.

That ended in December 2025. An amendment repealing both the 1991 and 2002 AUMFs was carried in the National Defense Authorization Act for Fiscal Year 2026, which President Trump signed into law on December 18, 2025. The Senate had adopted the repeal amendment on October 9, 2025; it survived the House-Senate conference and remained in the bill that became law.

This is a genuine structural milestone. It is the first time Congress has clawed back a war authorization since the 1971 repeal of the Gulf of Tonkin Resolution — and the first significant war-powers measure of any kind signed into law since the 2002 Iraq authorization itself. The repeal had been attempted repeatedly: the House first voted to include a 2002 AUMF repeal in the FY2020 NDAA in 2019, only to have it stripped in conference. The version that became law in December 2025 succeeded where roughly six years of prior efforts had failed.

The practical effect is bounded but real. Neither the 1991 nor the 2002 AUMF was the primary legal basis for any current operation; both functioned mainly as backup authorities that the executive branch could invoke when its claimed authority for a given operation was thin. Removing them closes off that fallback. It does not, by itself, end any ongoing operation — but it narrows the menu of stale authorizations available to stretch.

What stale AUMFs actually do

The substantive concern with stale AUMFs is structural. Congressional war authority is at the heart of the constitutional design. Article I gives Congress the power to declare war and to raise and support armies. Article II gives the President command authority over the armed forces in their actual operations.

The pattern of stale, broadly interpreted AUMFs collapses this distinction. The executive branch can argue that operations against new targets, in new locations, are authorized by a 24-year-old statute that did not contemplate the targets and did not name the locations. The argument is sometimes legally defensible in narrow cases; in the aggregate, it has produced an executive-branch war-making authority that Congress has not specifically approved.

Reform proposals address this:

Sunset. AUMFs should expire on a defined timeline (e.g., five years), forcing reauthorization rather than indefinite extension.

Specificity. AUMFs should name the specific target organizations or governments. New targets require new authorization, not stretched interpretation.

Geographic limits. AUMFs should specify the countries or regions in which operations are authorized, requiring expansion to be explicit rather than implicit.

Reporting requirements. Substantial executive-branch reporting on operations under AUMFs, with regular congressional review.

The political alignment that delivered the Iraq repeals

AUMF repeal produced unusual bipartisan alignment over several sessions, and that alignment is what finally carried the 1991 and 2002 repeals across the line. Senator Tim Kaine (D-VA) and Senator Todd Young (R-IN) were among the leading Senate advocates for repeal of stale AUMFs; the 2002 repeal had drawn bipartisan majorities in both chambers in multiple prior sessions before becoming law in the FY2026 NDAA.

The coalition behind repeal included libertarian-leaning Republicans concerned about executive war power, traditional foreign-policy moderates concerned about congressional abdication, and most Democrats. The opposition came primarily from members concerned about flexibility for executive-branch operations, and from those who worried repeal would constrain ongoing operations against ISIS or al-Shabaab. In the end, the case that the 1991 and 2002 statutes were obsolete — that they authorized force in conflicts that had ended decades ago — was strong enough to overcome that resistance, particularly once it was clear that neither statute was load-bearing for any current operation.

The 2001 AUMF repeal is harder, and that is why it was not part of the FY2026 NDAA. The 2001 AUMF is the legal basis for ongoing operations in multiple theaters. Repeal without a replacement framework would create a legal vacuum for those operations. Repeal with a replacement framework requires consensus on the replacement — which has proven elusive.

What remains: the 2001 AUMF

With the 1991 and 2002 authorizations repealed, the 2001 AUMF is the only standing authorization left — and it is the one the structural critique was always most about. It is the authorization with no named enemy, no geographic limit, no expiration date, and no list of authorized operations: 60 words that four administrations have stretched across more than a dozen countries and against organizations that did not exist in 2001.

Repeal of the 2001 AUMF now has its own dedicated vehicle. On December 16, 2025 — two days before the Iraq repeals were signed into law — Representatives Pramila Jayapal (D-WA) and Thomas Massie (R-KY) introduced H.R. 6751, the “Sunset for the 2001 Authorization for Use of Military Force Act.” The bill would repeal the 2001 AUMF 240 days after enactment, building in a transition window rather than an immediate cutoff. It was referred to the House Foreign Affairs Committee and has not received a floor vote.

The 240-day sunset is a deliberate design choice. It is a partial answer to the legal-vacuum objection: it gives Congress and the executive branch a defined period to negotiate a replacement framework, or to wind down operations that cannot be justified without one, rather than ending the authority overnight. It does not resolve the replacement question — it forces it onto a clock.

The replacement framework

A replacement AUMF would, in most serious proposals, include:

Identified target organizations. Specific named groups with operational connection to current concerns, not the 2001 framework’s “those who harbored them.”

Geographic scope. Specific countries or regions, with expansion requiring affirmative congressional action.

Sunset. Five-year or shorter expiration, with reauthorization required for continuation.

Robust reporting. Substantial executive-branch reporting on operations, target lists, civilian casualties, and strategic objectives.

Civilian harm protection. Specific provisions on civilian-protection standards and oversight of incidents.

Restrictions. Geographic, target-class, and operation-type limits that the 2001 AUMF has been read past.

Replacement proposals over recent sessions have included variants of these elements. None has yet cleared both chambers. H.R. 6751’s 240-day sunset is, in effect, a procedural forcing mechanism for exactly this debate: it does not itself supply a replacement, but it sets a deadline by which one must exist or the underlying authority lapses.

What still stands in the way of the 2001 repeal

The 1991 and 2002 repeals are done. The harder fight — the 2001 AUMF — faces the same obstacles it always has:

Implementation complexity. Repealing or replacing the 2001 AUMF requires consensus on operations that span multiple theaters, multiple agencies, and multiple administrations of differing political character. Each administration has its own preferences about flexibility versus constraint.

Executive branch resistance. The executive branch (across both parties’ administrations) has generally opposed sharply constraining AUMF reform. The institutional preference is for broader authority, and the 2001 AUMF is the broadest authority available.

Legislative bandwidth. AUMF reform competes with other priorities for floor time and political capital. It tends to advance when adjacent foreign-policy crises raise its salience — as the Iraq-AUMF repeals did, riding the must-pass NDAA rather than moving as standalone bills.

Specific operations. Operations against specific groups (al-Shabaab, AQAP, ISIS) create constituencies — both supportive and constraining — that complicate a clean repeal of the authority those operations rely on.

The lesson of December 2025 is that these obstacles are not insurmountable. The Iraq repeals succeeded because the case for obsolescence was overwhelming and because the repeal rode a vehicle that had to pass. The 2001 AUMF lacks the first advantage — it still authorizes live operations — so the path runs through the replacement-framework question rather than around it.

What to watch

• H.R. 6751. The Jayapal-Massie 2001 AUMF repeal — committee action in House Foreign Affairs, a possible Senate companion, and whether it draws the cross-ideological coalition the Iraq repeals did.
• A 2001 replacement framework. Whether the 240-day sunset prompts a serious negotiation over a narrowed, specific, sunsetted replacement authorization.
• The next NDAA. The FY2026 NDAA was the vehicle that carried the Iraq repeals; whether AUMF reform attaches to the FY2027 bill is worth tracking.
• Specific-operations War Powers Resolutions. Periodic resolutions targeting individual operations (Venezuela-related and Iran-related measures saw floor action in early 2026) — a parallel track to AUMF repeal for asserting congressional war authority.
• Civilian casualty data and reporting. Ongoing implementation of recent reporting reforms; affects the political environment for the remaining debate.

Bottom line

For two decades the honest summary of AUMF repeal was that it was the bipartisan reform that never quite happened. That is no longer true. In December 2025 Congress repealed the 1991 and 2002 Iraq war authorizations through the FY2026 NDAA — the first time it has clawed back a war authorization since 1971. The repeal is real, and it is structurally significant even though neither statute was the primary basis for a current operation: it demonstrates that Congress can reclaim a war power once it musters the coalition and the vehicle.

The work is not finished. The 2001 AUMF — the 60-word, open-ended authorization that the structural critique was always most about — remains in force, and its repeal now lives in H.R. 6751. Restoring congressional war authority is, like most structural reform, slow and unromantic. But the 2025 repeals show it is possible, and they reframe the remaining task: not whether Congress can take back a war power, but whether it will do so for the one that still matters most.