President Donald Trump's newly announced agreement with Iran is facing scrutiny not only from Democrats but also from some of his Republican allies, raising questions about whether Congress could slow, reshape, or possibly try and block portions of the deal.
Trump on Sunday announced that the United States and Iran had reached an agreement , with a formal signing ceremony expected later this week. The president confirmed on Monday that the deal was "all signed." The administration has described the arrangement as a memorandum of understanding (MOU) tied to a ceasefire and a framework for future negotiations, including discussions related to Iran's nuclear program.
While many Republicans have praised Trump's efforts to end hostilities with Iran, some GOP lawmakers have signaled concerns about the deal's details and have argued Congress should play a role in reviewing any agreement that could involve sanctions relief or long-term commitments toward Tehran.
Why Republicans Are Raising Concerns About Trump's Iran Deal
The Republican criticism is not necessarily opposition to diplomacy itself. Rather, several lawmakers have argued that Congress should closely examine any agreement that could ease pressure on Iran or alter U.S. policy toward the country.
Senator Chuck Grassley, an Iowa Republican, told Newsweek on Monday that Iran doesn't have "a very good history" of abiding by agreements. However, he said he hopes "they would change their tune." He declined to comment directly on the deal, saying he wanted to "read it" first and noting that it won't be released until Friday.
"I am somewhat concerned that Iran’s view of the agreement seems different from what the American negotiating team is claiming. Under our law, any nuclear deal with Iran will be sent to Congress for review and a vote. I look forward to reviewing the final product," Senator Lindsey Graham, a South Carolina Republican and close ally of the president, posted to X on Sunday.
On Monday, he spoke favorably of the deal, while again reiterating the role of Congress to review it. "I look forward to reviewing the actual document rather than relying on Iranian propaganda reports. The sooner it is released, the better," he said.
GOP Senator Ted Budd of North Carolina told Newsweek he is waiting for the deal to come before Congress, saying "we'll fully evaluate it." When pressed on whether there are conditions that should or shouldn't have been in the deal, Budd said, "We're definitely going to review that."
On Friday, before the deal was announced over the weekend, Senator Kevin Cramer, a South Dakota Republican, said he was "skeptical" of the pending deal. "I hope that we're not going to give up too much ," he said, adding that he appreciates Trump's "optimism" but remains "a little bit skeptical about the ability to endure through this."
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The concerns largely revolve around three issues:
Whether sanctions relief could provide Iran with substantial economic benefits.
Whether the agreement adequately addresses Iran's nuclear activities.
Whether Congress will have a meaningful role in reviewing or overseeing implementation.
Those questions are more prominent because the administration has not yet released the full text of the agreement, leaving lawmakers and analysts attempting to assess its scope and legal implications. Trump told reporters on Monday that he supports the release of the MOU, which he said should happen on Friday.
For many Iran hawks in both parties, the central issue is whether the agreement merely establishes a temporary framework for further talks or commits the United States to policy changes that Congress believes it should have an opportunity to review.
Vice President JD Vance, who was key to negotiating the deal, said Monday on X that the agreement ensures "Iran will never obtain a nuclear weapon and the Strait of Hormuz will be fully reopened." He added, "peace and prosperity for the American people, that's what this deal is all about."
What Role Does Congress Actually Play?
The role that Congress plays depends largely on how the administration structures the agreement.
Trump and senior administration officials have described the arrangement as an MOU rather than a formal treaty. Reports indicate the agreement serves as a framework for a ceasefire and future negotiations over unresolved issues, including Iran's nuclear program.
If the deal remains an executive agreement or political framework, Congress may have limited ability to stop it directly. Presidents of both parties have entered into international agreements without seeking Senate ratification.
Congress nevertheless retains some leverage. Lawmakers can conduct oversight hearings, pass legislation affecting sanctions, impose reporting requirements, restrict funding for implementation and seek votes expressing support or opposition to the agreement.
The key legal question may involve the Iran Nuclear Agreement Review Act, known as INARA. Passed in 2015 with overwhelmin…
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