Senate Moves to Curtail Trump's War Powers as Iran Ceasefire Takes Effect

Six weeks after the United States and Israel launched Operation Epic Fury against Iran — killing the country's Supreme Leader, striking nuclear facilities, and disrupting global energy markets — a Pakistani-brokered ceasefire took effect on April 8, 2026 [1]. Within hours, Senate leaders announced they would force yet another vote on a War Powers Resolution to restrict President Donald Trump's authority to resume hostilities without congressional approval [2]. The question facing Washington is no longer whether the war was wise but whether the Constitution's war-making framework can survive the precedent it set.

The War in Numbers: Costs, Casualties, and Consequences

Operation Epic Fury began on February 28, 2026, when U.S. and Israeli forces launched a sweeping campaign against Iran's military leadership, nuclear program, and strategic infrastructure [3]. The Pentagon burned through $5.6 billion in munitions in the first 48 hours alone [4]. By one estimate, the conflict has cost approximately $2.1 billion per day, with the American Enterprise Institute calculating total expenditures of roughly $31 billion through the first five weeks [4].

Source: The Intercept / AEI estimates

Data as of Apr 8, 2026CSV

The administration has requested $200 billion in supplemental war funding from Congress, a figure that drew bipartisan criticism. Senator Peter Welch (D-VT) called the spending "absolutely reckless" as the proposed fiscal 2027 defense budget reached $1.5 trillion — a 44 percent increase and the highest in modern U.S. history — funded partly by cuts to housing, education, and climate programs [5][6].

On the human side, the Pentagon confirmed 13 U.S. service members killed and 381 wounded in action as of April 8, with 330 of the wounded having returned to duty [7]. Six of the deaths occurred in a single Iranian drone strike on Port Shuaiba, Kuwait [7]. The Intercept reported discrepancies in official casualty counts, alleging that a Pentagon document listed 372 troops wounded — 23 percent higher than U.S. Central Command's public figures — prompting accusations of a "casualty cover-up" [8].

Source: Military Times / Pentagon data

Data as of Apr 8, 2026CSV

Iranian casualties were far higher. Iran's Ministry of Health reported at least 1,497 people killed, including 220 children and 254 women, along with 57 health workers [3]. The strikes killed Supreme Leader Ayatollah Ali Khamenei and several senior military and political figures in the opening days of the campaign [9].

The Ceasefire: What It Says, What It Leaves Out

The two-week ceasefire was brokered by Pakistan, with Prime Minister Shehbaz Sharif and Army Chief Field Marshal Asim Munir conducting overnight negotiations with Vice President JD Vance, Special Envoy Steve Witkoff, and Iranian Foreign Minister Abbas Araghchi [10]. The deal came less than two hours before Trump's deadline for Iran to reopen the Strait of Hormuz or face "massive destruction" of its civilian infrastructure [1].

Under the agreement, Iran committed to reopening the Strait of Hormuz — through which roughly a fifth of the world's oil flows — and both sides agreed to suspend military operations [11]. Pakistan invited U.S. and Iranian delegations to Islamabad for in-person negotiations on April 10 [10].

But the two sides are far apart on fundamentals. The U.S. has demanded that Iran decommission its nuclear facilities at Fordow, Natanz, and Isfahan, hand over all highly enriched uranium to the International Atomic Energy Agency (IAEA), accept strict external monitoring of centrifuges, dismantle its proxy networks, and agree to limits on its defense capabilities [12]. Trump posted on Truth Social: "There will be no enrichment of Uranium" [12].

Iran's 10-point counterproposal demands guarantees against future attacks, an end to Israeli strikes on Hezbollah in Lebanon, removal of sanctions, and — critically — the right to continue uranium enrichment [11]. Iran's Parliament speaker accused the U.S. of denying Iran's "right to enrichment" [13].

Vice President Vance described the agreement as a "fragile truce" [14]. Within hours of its announcement, Iran reportedly closed the Strait of Hormuz again after Israeli strikes continued against Hezbollah targets in Lebanon, and Iran's Tasnim News Agency reported Tehran was considering leaving the ceasefire on the very first day [14].

Oil Markets and Global Fallout

The war's disruption of Strait of Hormuz traffic sent oil prices sharply higher. WTI crude reached $114.01 per barrel in early April 2026 — up 86.7 percent year-over-year, from around $61 a barrel in April 2025 [15].

Source: FRED / EIA

Data as of Apr 6, 2026CSV

Iran had been charging as much as $2 million per vessel to transit the strait, and was negotiating a fee-sharing arrangement with Oman while insisting on maintaining military control of the waterway [14]. The economic consequences extended well beyond energy markets: Gulf states that hosted U.S. military assets faced direct Iranian retaliation. Within 48 hours of the war's start, Iran struck all six Gulf Cooperation Council nations, killing three people in Bahrain, four soldiers and four civilians in Kuwait, and three in Oman [16]. The UAE bore the heaviest bombardment, absorbing hundreds of drones and missiles [16].

NATO allies largely declined to join the campaign. Trump publicly rebuked NATO, Japan, South Korea, and Australia for refusing to participate in strikes on Iran [17]. The E3 — Britain, France, and Germany — offered only "proportionate military defensive measures" against drones and ballistic missiles. British Prime Minister Keir Starmer permitted U.S. use of British bases for "defensive" strikes only [17].

The Senate's War Powers Push

The Senate's latest attempt to restrict presidential war authority is the ninth such effort since the conflict began. Led by Senators Tim Kaine (D-VA), Adam Schiff (D-CA), and Minority Leader Chuck Schumer (D-NY), with Republican co-sponsor Rand Paul (R-KY), the resolution invokes the War Powers Resolution of 1973 to require explicit congressional authorization before any further hostilities against Iran [18][19].

Source: U.S. Senate roll call votes

Data as of Apr 8, 2026CSV

The procedural path is straightforward but the votes are not there. The War Powers Resolution allows a privileged resolution — meaning it can bypass committees and reach the floor with a simple majority — but every previous attempt has failed. In January, the vote was 44–56. In March, it narrowed to 47–53, with John Fetterman (D-PA) the only Democrat voting no and Paul the only Republican voting yes [20][21].

Schumer framed the ceasefire as further evidence that military force had failed. "The only viable solution is a lasting diplomatic one," he said. "A two-week ceasefire, especially one as fragile as this, is not a strategy" [2]. The Washington Times reported that the new vote is scheduled for next week, timed to coincide with the Islamabad negotiations [2].

The resolution's scope tracks the 1973 War Powers Resolution rather than replacing it. It would not repeal or amend the 2001 Authorization for Use of Military Force (AUMF) — which the administration has not invoked for the Iran campaign — but would specifically require that any continued military engagement with Iran receive a separate, explicit congressional authorization [18].

Constitutional Precedent and the "Political Question" Trap

The constitutional debate is older than the Republic. Article I, Section 8 grants Congress the power to declare war. Article II, Section 2 makes the president commander in chief [22]. Every president since Nixon has considered the War Powers Resolution unconstitutional in some form, and none has fully complied with it [23].

The precedents are stacked against congressional control. Truman deployed troops to Korea in 1950 without authorization, calling it a "police action" under UN authority. Obama conducted airstrikes in Libya in 2011 without congressional approval, arguing the campaign did not constitute "hostilities" because no U.S. ground forces were at risk. Trump himself launched 59 Tomahawk missiles at Syria's Shayrat airbase in 2017 without a war declaration [23][24].

Federal courts have consistently declined to adjudicate war-powers disputes. The judiciary treats the allocation of war-making authority between the executive and legislative branches as a "political question" — a doctrine that effectively leaves enforcement to political rather than legal mechanisms [22]. The ACLU noted that while Congress has the power to end the war through legislation or the power of the purse, getting a veto-proof majority remains the central obstacle [25].

The Case for the Strikes

The administration and its defenders argue the campaign achieved what decades of diplomacy could not. The White House released a statement asserting that Trump's "clear and unchanging objectives" had driven "decisive success" against the Iranian regime [26]. Defense Secretary Pete Hegseth claimed Iran's "nuclear ambitions have been obliterated" [27].

Supporters point to concrete outcomes: the killing of Khamenei and senior military leaders, the physical destruction of enrichment facilities at Fordow, Natanz, and Isfahan, and the forced reopening of the Strait of Hormuz [9][12]. The Heritage Foundation and some former defense officials have argued that the strikes achieved a deterrence reset — demonstrating that the U.S. would use force against Iran's nuclear program after years of what they describe as failed engagement.

Senator Lindsey Graham (R-SC) and other Republican supporters of the campaign have emphasized that Iran's nuclear breakout timeline had shortened to weeks before the strikes, making military action urgent. The administration's position is that diplomatic efforts over the preceding decade — including the 2015 JCPOA, from which Trump withdrew in 2018 — had failed to prevent Iran from advancing its enrichment capabilities.

The Case Against

Critics counter that the strikes may have been counterproductive. A November 2025 White House document used the word "degraded" to describe damage to Iran's nuclear program — language significantly weaker than the "obliterated" claims made after the February strikes [27]. FactCheck.org noted that Trump's assertion that Iran could "soon" develop missiles capable of reaching the U.S. was contradicted by a 2025 Defense Intelligence Agency assessment estimating such capability was at least a decade away [28].

Arms-control analysts at the London School of Economics warned that the military campaign may have replaced Iran's "latent nuclear capability" with a "nuclear grievance" — that by demonstrating conventional deterrence had failed, the strikes gave Tehran its strongest strategic argument yet for racing to complete a nuclear weapon [29]. About three-fifths of Americans oppose the war, according to public opinion surveys [9].

Defense Industry and Domestic Politics

The war generated immediate returns for Pentagon suppliers. Lockheed Martin shares rose 3.4 percent following the initial strikes, RTX jumped 4.7 percent, and Northrop Grumman posted a 6 percent gain [30]. Major contractors — Lockheed Martin, Raytheon, Boeing, General Dynamics, BAE Systems, Textron, Northrop Grumman, and General Atomics — actively lobby the congressional committees overseeing defense policy, the federal budget, and foreign relations [30]. The defense sector spent $70 million on lobbying in the first half of 2023 alone, according to OpenSecrets, and those figures are expected to be significantly higher for the current cycle [31].

The political geography is complex. Veterans' groups are split, with some supporting the mission as necessary for national security and others opposing the open-ended commitment. Swing-state constituencies face competing pressures: rising energy prices and inflation driven by Strait of Hormuz disruptions versus the political cost of appearing to oppose troops in the field. The Friends Committee on National Legislation noted the stark tradeoff in Trump's budget: "money for war" funded by cuts to domestic programs [32].

If the Ceasefire Collapses

CSIS identified several trigger points that could unravel the agreement [33]. Israeli operations against Hezbollah in Lebanon — which continued after the ceasefire was announced — remain the most immediate flashpoint. Iran has explicitly tied the deal's survival to a halt in those strikes [14]. Unresolved disputes over uranium enrichment, sanctions relief, and the Strait of Hormuz fee structure could derail the Islamabad negotiations before they produce a lasting agreement.

Iran retains significant escalatory options: resuming uranium enrichment to higher levels, activating proxy networks across the region, and re-closing the Strait of Hormuz. The IRGC's drone and missile capabilities, while degraded, were not eliminated [33].

If Congress passes the proposed War Powers Resolution before hostilities resume — an outcome that would require several Republican defections or a shift in Fetterman's position — the president would face a legal constraint on unilateral re-engagement. The administration would likely invoke Article II commander-in-chief authority to claim the right to respond to imminent threats, a justification every modern president has used and no court has blocked [22][23].

The more likely scenario, based on the pattern of eight failed votes, is that the resolution falls short again — leaving the constitutional question precisely where it has been since 1973: unresolved, and increasingly urgent.

What Comes Next

Negotiations in Islamabad are set to begin April 10. The Senate vote on the War Powers Resolution is expected next week. The two-week ceasefire window closes around April 22. Between now and then, the competing pressures — a fragile truce in the Middle East, a constitutional standoff in Washington, and $114 oil — will test whether American institutions can impose accountability on a war that most of the public opposes and Congress never authorized.