Republicans have so far been willing to let President Donald Trump act without congressional approval on Iran. Their patience is running out.

The war hits its 60th day on Friday, which under the 1973 War Powers Act is the deadline for the White House to secure congressional authorization for hostilities. The law allows a limited 30-day extension to wind down operations, but lawmakers are divided over whether that provision gives Trump more runway or forces Congress to step in.

Some Republicans who have opposed curbs on Trump’s Iran war powers have suggested they may change their thinking after the 60 days are up.

Senate Appropriations Chair Susan Collins said Tuesday she is open to supporting a resolution to end U.S. military involvement if the 60-day deadline passes without congressional approval for further action.

She previously voted against war powers resolutions meant to limit Trump’s actions on Iran.

“If there are military hostilities beyond the 60 days, Congress has to authorize them, or Congress can block them, but Congress has to act,” Collins said.

Senate Democrats, with support from Republican Sen. Rand Paul, have so far brought five resolutions to the floor since the war began as part of a strategy to force debate and routine votes on U.S. action abroad, all of which have failed.

Another one is expected later this week — and lawmakers will have a chance to question leaders on the war when Defense Secretary Pete Hegseth and Joint Chiefs of Staff Chair Gen. Dan Caine testify before the House on Wednesday and the Senate on Thursday.

Republican Sen. John Curtis of Utah said he’s wary of allowing the conflict to continue without a formal vote. He has said he would not support the ongoing military action beyond the 60 days without congressional approval, though he is open to a 30-day extension as peace negotiations continue.

“I am not opposed to a resolution” to end U.S. military action against Iran, Curtis told NOTUS. “I want to obviously see what’s in it.”

Some Republicans are working on a way to assert Congress’ authority by affirmatively supporting the war.

After frustration with the administration’s lack of transparency, Sen. Lisa Murkowski is drafting legislation to authorize the war in Iran, aiming to force Congress to go on the record and put limits around the conflict.

Murkowski on Tuesday declined to comment on the status of that measure.

Other Republicans are ready to give the administration additional time, but only if it follows the law and provides a clearer plan for the war. Under the War Powers Act, the 30-day extension is a limited window for winding down the operation, allowed only if the president certifies in writing to Congress that “unavoidable military necessity” tied to the safety of U.S. forces requires more time to bring about their “prompt removal.”

Sens. Todd Young, Josh Hawley and Thom Tillis said they want to see the administration’s strategy for winding down the conflict in conjunction with any extension.

“Since we’re not hearing about any imminent withdrawal plans, my expectation is there is going to be an extension and an associated plan,” Young told NOTUS.

Young said if the administration fails to notify Congress or justify an extension, he’d be open to voting for legislation to limit the war.

“I’m assessing all my options, but I am not taking any options off the table,” Young said. “It all depends on what we hear from the administration.”

But Hawley said it would be concerning if the administration did not come to Congress at all to seek an extension.

“Let’s hope that there’s not just stasis, that just nothing happens between now and the end of the month,” he said.

Tillis said the administration must give Congress details on the timeline, funding and endgame before Congress accepts the extension.

“It’s not a rubber stamp. You map out what you need the 30 days for,” Tillis said. “It just can’t be a, hey, we need 30 more days … That’s irrational.”

Most Republicans are expected to defer to the administration if it seeks an extension.

Ohio Rep. Warren Davidson was one of only two House Republicans to break with their party and support a House war powers resolution to restrict Trump’s ability to engage in military action against Iran. But he has since said Trump should have until the 90-day deadline to wrap up the war.

“We’re in the middle of a ceasefire right now, trying to negotiate an end to it, so bring it up now, it’s like it’s designed to undermine that,” he said. “To me, the most rational next time we should vote on it is 90 days after the start of the conflict.”

The administration is expected to face intensified scrutiny this week with Hegseth and Caine set to testify before the House and Senate as lawmakers press for more clarity.

South Dakota Sen. Mike Rounds speculated that the administration would submit a formal notice seeking a 30-day extension ahead of Hegseth and Caine appearing before Congress. Lawmakers, he said, are likely to rely on additional classified briefings before deciding how to respond.“I get a lot more information in a classified setting than I will in an open setting,” Rounds said. “After that, provide the American people everything that we can whose release would not hurt or threaten our young men and women who are still in harm’s way.”