WASHINGTON, Sept 15 – The U.S. House of Representatives voted for a third time Tuesday to limit President Donald Trump’s authority to continue military operations against Iran without congressional approval, as the conflict approaches its seventh month and its financial and political consequences grow.
The war powers resolution passed 220-204, with all voting Democrats joined by seven Republicans. The vote marked another attempt by lawmakers to invoke Congress’ constitutional role in decisions involving prolonged military action, although the measure faces significant obstacles before it could become law.
The latest vote came as lawmakers prepare to leave Washington and return to their districts for the final stretch of campaigning before the November midterm elections. The conflict in Iran has increasingly become part of the domestic political debate, particularly as disruptions to energy supplies through the Strait of Hormuz have contributed to higher fuel prices.
The resolution is not expected to reach the president for enactment. Earlier House measures seeking to end or restrict the military campaign did not advance to the White House, and Trump has opposed congressional efforts to force an end to the operation.
Rep. Seth Moulton, a Massachusetts Democrat and former Marine who served during the Iraq War, was among the lawmakers pressing for the latest measure. He argued that the prolonged conflict requires Congress to exercise its constitutional authority rather than allowing the administration to continue military operations without a new authorization.
Republicans supporting the administration took a different position. Rep. Brian Mast of Florida, chairman of the House Foreign Affairs Committee, questioned what military resources opponents of the war would remove from the region while Iran continues to pose what he described as a threat to the United States.
Mast said Trump had campaigned against what he called “forever wars” and argued that the president’s approach was intended to bring an end to years of confrontation involving Iran.
The divide reflects a broader disagreement in Congress over how far presidential authority should extend once military operations continue for months and the United States remains engaged in hostilities abroad.
Iran war becomes a growing issue ahead of midterm elections
Tuesday’s vote is likely to be the final House action specifically addressing the Iran war before lawmakers return home to campaign ahead of the midterm elections.
Trump launched the U.S. military campaign against Iran on Feb. 28. Since then, the conflict has included periods of intense missile exchanges followed by temporary lulls, while attacks and military operations have continued to affect the wider Middle East.
The economic impact has become an increasingly important part of the debate in Washington. The Congressional Budget Office said Tuesday that the conflict had cost the United States more than $38 billion as of Aug. 1. The agency estimated that military costs could continue increasing by roughly $2 billion to $3 billion a month, depending on the intensity of the fighting.
The CBO also projected that the war would add about 0.5 percentage points to inflation compared with its earlier expectations through 2027. Higher energy costs have added to concerns about the broader economic consequences of the conflict.
The Strait of Hormuz has remained central to those concerns. The narrow waterway is one of the world’s most important routes for oil shipments, and disruption to traffic through the strait has contributed to volatility in global energy markets.
For Americans already dealing with higher household costs, gasoline prices have become a particularly visible consequence of the conflict. House Speaker Mike Johnson acknowledged the pressure Tuesday, saying that bringing fuel prices down remains important.
Johnson nevertheless defended the administration’s position on the war. He said the conflict appeared to be entering what he described as a “new phase,” with U.S. allies becoming more involved in efforts to stabilize the region. He also linked the prospect of easing energy costs to developments following the election.
The political challenge for Republicans is complicated by Trump’s earlier promises to avoid involving the United States in foreign wars. The president’s military campaign against Iran has created divisions within his party, particularly among Republicans who have traditionally favored a more restrained approach to overseas military involvement.
An AP-NORC poll conducted in July found that a majority of Americans viewed the war as not worth fighting. The conflict’s economic effects and continued military casualties have added to the pressure on lawmakers as they campaign for reelection.
Seven Republicans voted with Democrats in Tuesday’s House vote: Zachary Nunn and Mariannette Miller-Meeks of Iowa, Nancy Mace of South Carolina, Tom Barrett of Michigan, Warren Davidson of Ohio, Brian Fitzpatrick of Pennsylvania and Thomas Massie of Kentucky.
The number was higher than during the previous House votes on the issue. Four Republicans had supported earlier efforts to halt the military campaign.
The votes from Nunn and Miller-Meeks are notable because Iowa is expected to be closely contested during the midterm cycle. Mace, meanwhile, is retiring from Congress, making her vote one of the final occasions in which she will take a position on the issue as a House member.
Congress tests the limits of presidential war powers
The repeated House votes have highlighted an unresolved constitutional dispute over the balance between congressional authority and presidential power during military conflicts.
The Constitution gives Congress the power to declare war, while the president serves as commander in chief of the armed forces. The War Powers Resolution, enacted after the Vietnam War, was designed to place additional limits on prolonged military operations without congressional authorization.
Under the law, presidents generally must notify Congress when U.S. forces are introduced into hostilities and face time limits for continuing those operations without congressional authorization.
Congress has attempted several times this year to use those powers in response to the Iran conflict. The House approved its first war powers resolution concerning Iran in June and followed it with another measure in July. The Senate also briefly approved a resolution seeking to end the conflict, but Senate Republicans reversed course the following day after Trump criticized the effort during a private lunch with lawmakers.
The repeated votes have therefore produced political pressure without changing the military situation on the ground.
Tuesday’s measure faces the same fundamental obstacle as the earlier resolutions. Even if it advanced through the Senate, Trump would have the opportunity to veto it, while Congress would need sufficient votes to overcome a presidential veto.
For lawmakers opposed to the war, however, the votes provide a formal record of their position and keep the question of congressional authority before the public.
For Republicans supporting Trump’s policy, the central argument remains that Iran represents an ongoing security threat and that restricting the president’s military authority during the conflict could affect U.S. forces and regional allies.
The financial burden is adding another dimension to that debate. The CBO’s latest assessment puts the direct cost of the conflict at more than $38 billion through Aug. 1, while the continuing monthly expense means the total is expected to rise if military operations persist. The agency has also examined the broader economic and budgetary effects of the fighting as energy prices and federal spending remain under pressure.
With lawmakers leaving Washington later this week, the House vote may become an important campaign issue as candidates return to their districts. Republicans will defend the administration’s military strategy and its stated goal of confronting Iran, while Democrats and some Republicans will continue pressing questions about congressional authorization, the financial cost and the impact on American households.
The conflict is therefore entering another stage in Washington, not only as a military confrontation involving Iran and the United States, but also as a dispute over presidential authority, federal spending, energy prices and the role Congress should play in decisions that could keep U.S. forces engaged overseas.
As the midterm elections approach, those questions will move increasingly from the House floor to campaign trails across the country.