Several Republican lawmakers have criticised a US-Iran memorandum of understanding (MoU) aimed at ending a four-month war and reopening the Strait of Hormuz, warning that the agreement includes major concessions that could undermine US security interests.

The 14-point framework, signed electronically by the presidents of the United States and Iran, was made public by US officials following the announcement of the deal.

Republican Senator Bill Cassidy of Louisiana sharply condemned the agreement in a post on social media platform X, saying: “Reagan is rolling over in his grave.”

He argued that Iran’s nuclear ambitions had not been curtailed and claimed the agreement could encourage Tehran to use pressure over the Strait of Hormuz in future negotiations.

“Now, Iran gets to build brand-new infrastructure under this deal,” Cassidy said, adding that sanctions relief and the end of military operations came at a high cost for the United States.

Republican Senator Ted Cruz of Texas also expressed concern, telling conservative outlet The Daily Wire that elements of the publicly released text appeared “ill-advised,” though he said he would review further details.

“History teaches that giving billions of dollars to theocratic lunatics who want to murder us is a bad idea,” Cruz said.

Senator Lindsey Graham initially raised concerns about the agreement but later offered cautious support after discussions with US officials, saying reopening the Strait of Hormuz and ending hostilities could have economic benefits.

“Whether or not the United States can reach an acceptable, verifiable deal with Iran regarding its nuclear programme and other issues is yet to be determined, but I see little downside to trying,” Graham wrote on X.

He added that stabilising maritime trade routes and halting hostilities could create “a pathway to peace well beyond the Iranian conflict.”

The memorandum was signed remotely by the two countries on Wednesday, according to officials.

The agreement outlines an immediate and permanent cessation of military operations across all fronts, including Lebanon, and calls for the lifting of the naval blockade on Iran within 30 days, along with safe passage for commercial shipping through the Strait of Hormuz.

It also includes provisions for a minimum $300 billion reconstruction and economic development package for Iran, oil export waivers, and the release of frozen Iranian assets.

Tehran has reaffirmed it will not seek nuclear weapons under the deal, while the future of Iran’s enriched uranium stockpile will be addressed in subsequent negotiations.