Senator Todd Young (R-IN) declared Friday that the Trump administration must secure congressional approval before undertaking any further military operations against Iran, directly challenging the administration's legal argument that the 60-day war powers clock had been reset by the recent ceasefire.

“The purpose of the War Powers Act was to assert the constitutional responsibility of Congress to declare war,” Young said in a statement to The Hill. “We must ensure that the people, through their elected representatives, weigh in on whether to send our military into combat. This should not be controversial.”

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President Trump notified Congress of the military campaign in a March 2 letter, which set the conflict's duration at 60 days under the War Powers Resolution. That deadline fell on Friday, requiring the president to either wind down hostilities or obtain legislative authorization to continue.

However, a senior Trump administration official argued Thursday that the campaign was effectively “terminated” when Trump announced a temporary truce with Tehran on April 7, resetting the clock for War Powers Resolution purposes. Defense Secretary Pete Hegseth echoed this reasoning during a Senate Armed Services Committee briefing earlier in the day.

Young pushed back, stating that the administration's stance means “there should be no hostilities moving forward,” and he expects the White House to work with lawmakers on a military force authorization if fighting resumes.

Trump doubled down on the timeline extension in a formal letter to Congress on Friday, telling lawmakers there had been “no exchange of fire” since the ceasefire began, but warning that the threat from Tehran “remains significant.”

“Accordingly, the Department of War continues to update its force posture in the AoR [Area of Responsibility] in select countries, as necessary and appropriate, to address Iranian and Iranian proxy forces’ threats and to protect the United States and its allies and partners,” the president wrote.

Republican support for the military action showed cracks on Thursday when Senator Susan Collins (R-ME) joined Democrats and Senator Rand Paul (R-KY) in voting to curtail Trump’s authority to wage further military action without congressional approval. The war powers vote was defeated for a sixth time, however, with Young siding with all other Republicans in opposing it.

The War Powers Resolution of 1973 requires the president to notify Congress within 48 hours of military action in response to an imminent threat and prohibits armed forces from remaining for longer than 60 days without a vote from Congress. The president may also request a 30-day extension to ensure the safe withdrawal of troops.

When asked Friday whether he would now seek approval from lawmakers, Trump dismissed the idea. “It’s never been sought before, there’s been numerous, many, many times and nobody’s ever gotten it before, they consider it totally unconstitutional,” Trump told reporters at the White House.

This clash over war powers comes amid broader tensions over executive authority. For more on related legal battles, see our coverage of a federal judge blocking Trump's TPS termination for Yemeni nationals and the president's declaration that the War Powers Act is unconstitutional.