Addendum from Axios: If Iran agrees to allow UN inspectors to visit its nuclear sites, it could receive exemptions on oil sales and see some of its frozen assets freed up to buy food and other humanitarian goods. An American official said: "We are waiting for Iran's response. "The idea is that the Iranians can say that they did not give up enriched uranium in the first place, and the US can say that it received a nuclear concession from Iran." A regional source said the White House told negotiators it would respond if Iran accepted the proposed deal after it was informed.