A Gulf official told The New York Times that Qatari brokers were working on a deal in which both Iran and the United States would offer a series of concessions over a five-day period, including Iran reopening the Strait of Hormuz and the United States lifting its naval blockade of Iranian ports. The most important obstacles facing this agreement are the timing of the implementation of the concessions by each side, as well as the insistence of the Qatari mediators to provide concessions on Iran's nuclear program, which are rejected by the Iranian negotiators.