The agreement between the United States and Iran announced by President Donald Trump has drawn significant scrutiny and skepticism from lawmakers on Capitol Hill, with both Republicans and Democrats demanding more clarity before any formal approval process moves forward. While the White House has described the deal as a step toward ending hostilities and reopening key maritime routes, members of Congress say crucial details remain undisclosed.

The reported agreement, which is expected to be ceremonially signed in Geneva, reportedly focuses on reopening the Strait of Hormuz and lifting naval restrictions in the region, alongside financial incentives for Iran tied to compliance benchmarks. However, lawmakers returning to Washington on Monday said they had not received detailed briefings, raising concerns about transparency and enforcement mechanisms.

Senate Majority Leader John Thune expressed uncertainty about the scope of the deal, stating that even senior lawmakers who typically receive classified briefings had limited information. He emphasised that key unanswered questions revolve around compliance verification and enforcement, particularly how Iran’s obligations would be monitored and what safeguards would prevent violations of nuclear-related commitments.

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Other Republican senators echoed similar concerns, with some questioning whether they could take the agreement seriously without access to the full text. Senator Thom Tillis said that without public disclosure of the document, it was difficult to assess its credibility. Senator John Kennedy also said he remained cautious, stressing that any agreement with Iran must include strict verification mechanisms due to longstanding mistrust.

Vice President JD Vance said the administration planned to release the text of the agreement shortly and insisted that Iran would not receive financial benefits unless it met its obligations. He and other officials defended the deal as a structured diplomatic framework designed to prevent nuclear escalation while maintaining pressure on Tehran through conditional incentives and sanctions-related provisions.

Democratic lawmakers also raised concerns, comparing the emerging arrangement to the 2015 JCPOA nuclear deal under the Obama administration and questioning what had materially changed. Senators including Mark Warner, Elizabeth Warren and Tim Kaine highlighted the need for clear details on sanctions relief, nuclear oversight and regional security implications. While some lawmakers acknowledged the importance of de-escalation, they stressed that Congress must fully review the agreement before any long-term commitments are made, leaving its legislative future uncertain.

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