Republicans react to an interim US-Iran agreement with criticism, arguing it amounts to an unnecessary concession. Sen. Bill Cassidy of Louisiana calls it “the worst foreign policy blunder in decades,” saying Iran’s nuclear ambitions are not curbed and that Iran learned it can use threats to the Strait of Hormuz as leverage. Across Republican commentary, the deal is framed as failing to address key security concerns while allowing Iran to continue aggressive behavior. In addition to broad skepticism of the agreement itself, some criticism within the party also focuses on JD Vance, with some commentators attributing responsibility for the policy stance to him rather than limiting their critique to the terms of the deal. The reporting emphasizes that while Republicans broadly share doubts about the interim arrangement, there is variation in how they assign blame—some concentrating on the substance of the agreement and others directing it toward specific figures associated with the policy.