US Resumes Large-Scale Iran Strikes, Trump Vows to Hit 'Much Harder' and Rejects Iran's Truce Offer as Senate Falls One Vote Short of Ending the War (September 2026)

What Happened

The Lull Ends (August 30 – September 2)

US strikes on Iran had largely paused since late July (see the July 2026 entry), though the naval blockade remained in force. On Sunday, August 30, the US struck Larak Island in the Strait of Hormuz. On August 31, Iran launched ballistic missiles and drones at bases hosting US forces, saying it was retaliating (Stars and Stripes).

On September 1, US Central Command began strikes at noon Eastern time on "air defense sites, radar systems, maritime assets and facilities, mine laying capabilities, and communications sites," citing attempted IRGC attacks on commercial shipping and on US service members (Stars and Stripes). Al Jazeera reported strikes at Sirik, Konarak, Bandar Abbas, Jask, Asaluyeh, Ahvaz and Qeshm Island. Trump wrote on Truth Social: "The strikes are large and powerful, and in retaliation for the Iranians' failed attempt at adding sea mines to the Strait."

Iran's health minister reported 18 people killed and 108 wounded that day (Reuters). The dead included guests at a wedding in Kuhestak, Sirik, documented in the Sirik wedding strike entry; IRNA, citing a deputy governor, reported seven deaths at three locations in Khuzestan (Al Jazeera), and NBC News reported four IRGC aerospace personnel killed in Kermanshah. The IRGC fired on US-linked sites in Jordan, Bahrain, Kuwait, Iraq's Erbil province and the UAE.

On September 2, Trump told reporters: "It was a very heavy attack last night, and we're prepared to do another one any time we want," warning that Iran "will be hit again at a much harder and higher level" (NBC News). Around the same time he wrote: "I'm not trying to force Iran to the bargaining table, as ABC Fake News reported," saying he preferred "almost total control of the Hormuz Strait, and their economy totally collapsing" (Al Jazeera).

Congress: One Vote Short

Late on September 15, the House voted 220–204 for a war powers resolution to halt US military action against Iran, its third such approval; seven Republicans voted yes. Rep. Zach Nunn (R-Iowa) said "with the negotiating window closed, sustained combat operations now require congressional authorization" (Al Jazeera).

On September 24, the Senate rejected H.Con.Res. 89 — adopted by the House in July — by 49–50. It would have directed the President to "remove the use of United States Armed Forces from hostilities against the Islamic Republic of Iran" absent a declaration of war or specific authorization. Republicans Susan Collins, Lisa Murkowski, Rand Paul and Thom Tillis voted yes; Democrat John Fetterman voted no (CBS News). Tillis, voting yes for the first time, cited the passage of 60 days since the administration notified Congress in July of renewed military action — the War Powers Resolution threshold. Stars and Stripes counted it as the Senate's 14th consideration of a war powers measure since the bombing began in February, noting a Pentagon cost estimate of about $42 billion; Sen. Andy Kim said at least 19 US service members had been killed. Sen. Tim Kaine said of the war power: "It is not his decision; it's our decision."

The Truce Offer Rejected

During the UN General Assembly, Qatar mediated an Iranian proposal for a seven-day roadmap: the US would lift the naval blockade, waive oil sanctions and release $12 billion in frozen assets; Iran would reopen the Strait of Hormuz and begin negotiations on a final agreement, with a regional ceasefire extending to Lebanon and Yemen. On September 26, Trump told reporters: "I reject their proposal," adding "that deal would not be acceptable" and arguing that Iran wanted an agreement because it was "losing so badly" (Al Jazeera). A late-August Reuters/Ipsos poll cited by Al Jazeera found 63 percent of Americans opposed the war.

Legal Analysis

Seven Months Without Authorization

By the end of September, the United States had been in hostilities with Iran for seven months without a declaration of war or authorization for use of military force. The War Powers Resolution requires the President to terminate unauthorized hostilities within 60 days of the required report; that deadline passed in April (see the crime-of-aggression entry). That a bare majority of the House and 49 senators voted to enforce it — and that it failed by a single Senate vote — does not cure the absence of authorization. It documents that the war continues on presidential authority alone, over the stated objection of half of Congress.

Force as Leverage, Not Self-Defense

Article 51 of the UN Charter permits force only in self-defense against an armed attack, and only as necessary and proportionate. Iran's attacks on shipping and on US forces are themselves serious violations. But Trump's own framing — preferring "almost total control of the Hormuz Strait" to a negotiated reopening, promising to strike "much harder," and rejecting a proposal to reopen the strait because Iran was "losing so badly" — describes force used to secure strategic control and bargaining advantage rather than force limited to what is necessary to repel attacks. That is the distinction on which the legality of the continuing campaign turns.

Civilian Cost

The September 1 strikes included a strike on a wedding in Sirik, whose location Reuters verified. Each renewed round of strikes on populated coastal areas carries foreseeable civilian harm that, absent a lawful basis for the use of force at all, cannot be justified by military advantage.