President Trump has toughened the terms of a potential framework to end the war in Iran and sent the revised proposal back to Tehran for consideration, according to three officials cited by the New York Times. The specific changes were not immediately clear, but two officials said Trump has been concerned about provisions that would unfreeze Iranian funds, a move he has sharply criticized President Obama for making in the earlier nuclear deal. Trump has also grown frustrated with the pace of Iran's response to US proposals, which have been negotiated through intermediaries including Pakistan.

One official said the tougher terms were potentially designed to accelerate the process by pressuring Iran to accept the framework already sent to Supreme Leader Mojtaba Khamenei, though reaching him has been difficult and any changes could cause further delays. Trump met for two hours with top aides in the Situation Room on Friday but left without an announcement. The framework would end the US-Israeli military campaign against Iran—which began on February 28—in exchange for Iran lifting its blockade of the Strait of Hormuz, while the most contentious issues, including Iran's nuclear program, would be deferred to later talks.