A May 1 deadline threatens to make continued military action in Iran unlawful without congressional approval.
The War Powers Resolution is a federal law giving U.S. presidents 60 days to conduct military operations without congressional authorization, followed by a narrow 30-day period to wind down forces. That clock expires this week and requires lawmakers to either authorize the war or force a withdrawal, setting up a potential legal and constitutional showdown if neither happens.
On April 15, U.S. Senate lawmakers voted 52-47 to block a motion to advance a resolution that would have required congressional approval for continued U.S. military operations tied to Iran, marking the fourth failed attempt this year to challenge the Trump administration’s authority.
That measure, led by Sen. Tammy Duckworth (D-IL), was aimed at forcing a vote on whether to authorize the conflict or compel a withdrawal under the War Powers Resolution.
The vote exposed divisions in both parties over Congress’ role in authorizing military force. Sen. Rand Paul (R-KY) was the only Republican to support the effort, while Sen. John Fetterman (D-PA) broke with Democrats to oppose it.
Duckworth sharply criticized the administration’s actions and Republicans who opposed the measure.
“This war is flat-out illegal. Trump didn’t have the authority to launch it in the first place, and nearly two months in, he still has not provided a reasonable justification for why we’re in this mess,” Duckworth told Military.com in a statement Monday.
“While Republicans wrongly claim the President has 60 days to seek authorization, even that fake deadline is looming,” she added.
Duckworth said Democrats have continued pushing votes to try to stop the conflict.
“Senate Democrats have been trying to act as a check on this wanna-be dictator by forcing votes on our War Powers Resolutions that would stop the fighting,” she said.
“I hope as we approach the deadline they’ve set for themselves, Republicans will finally stop abandoning their constitutional duty and join us in reining in Trump’s war of choice.”
Republican leadership has largely backed President Donald Trump’s approach, arguing he retains broad authority as commander in chief in a fast-moving conflict.
However, some GOP lawmakers have signaled concern that congressional approval may be needed if operations continue past the May 1 deadline or further expand.
White House Rejects Claims Iran War Is Illegal
The White House is pushing back on growing legal criticism, insisting the Iran campaign is lawful and does not require new congressional authorization.
“President Trump has been transparent with the Hill since before Operation Epic Fury began, and administration officials provided over 30 bipartisan briefings for members of Congress,” White House spokesperson Anna Kelly told Military.com on Monday.
Kelly said the administration still sees a diplomatic path forward.
“The President’s preference is always diplomacy, and Iran wants to make a deal,” she said.
A White House official, speaking on background, said the administration remains in active discussions with lawmakers as the deadline approaches.
“The administration is in active conversations with the Hill on this topic,” the official told Military.com.
The official also criticized efforts in Congress to limit the president’s authority.
“Members of Congress who try to score political points by usurping the Commander-in-Chief’s authority would only undermine the United States Military abroad, which no elected official should want to do,” the official said.
A Defense Department spokesperson declined to comment to Military.com.
Legal Fight Hits Breaking Point Ahead of May 1 Deadline
The approaching May 1 deadline could mark a decisive turning point in the conflict.
Christopher Anders, director of the Democracy and Technology Division at the American Civil Liberties Union, said the law was never intended to give presidents a two-month window to wage war without approval.
“It was written to bring unauthorized actions to a quick end,” Anders told Military.com on Monday, adding that continuing military operations beyond the 60-day deadline without congressional authorization would violate the law.
There is nothing under the War Powers Resolution that allows the president to continue beyond those 60 days.
Anders said the Constitution is clear that Congress, not the president, is responsible for authorizing the use of force.
The stakes could escalate further if the conflict expands, with some lawmakers warning that additional U.S. involvement— such as the hypothetical deployment of ground forces—may require a more explicit congressional role.
If the administration continues operations past the deadline without authorization, Anders said the conflict would lose any remaining legal justification, setting up a potential constitutional clash and shifting the fight to Congress over whether to fund the war.
Constitutional Showdown
The standoff is moving toward a potential constitutional test between Congress and the White House.
Democrats are expected to continue forcing votes in the Senate, while House lawmakers prepare their own war powers resolution in an effort to compel a vote on whether to authorize the conflict or force a withdrawal.
House Democratic leader Hakeem Jeffries (D-NY) has said Democrats will force another House vote, increasing pressure on Congress to formally weigh in before the deadline.
Sen. Tim Kaine (D-Va.), who has led similar war powers efforts, also criticized the administration’s handling of the conflict.
“The Trump-Vance Administration launched a war against Iran with no strategy, no congressional authorization, and little support from the American people,” Kaine said in a statement to Military.com Monday.
“The war hasn’t made us or our allies safer, U.S. servicemembers have been killed and injured, gas prices are soaring, and our munitions stockpiles have been depleted,” he said.
Kaine said he plans to continue pushing lawmakers to act.
“I’m going to continue pushing my colleagues to stand up and end the war against Iran,” he said.
The fight reflects a broader, decades-long shift in which presidents have repeatedly expanded military authority while Congress has struggled to reclaim its constitutional role.
If that deadline passes without authorization and military operations continue, Anders said the conflict could lose any remaining constitutional footing.
“It will have stripped away any veneer of lawfulness,” Anders said.
