What Happened Speaking at New York's Hudson Institute think tank ahead of next week's key U.N. General Assembly meetings, Brian Hook, the U.S. special envoy for Iran, said Washington was seeking to negotiate a treaty with Tehran that would cover Iran's ballistic missile and nuclear weapons programs. Is the U.S. Shifting Its Demands? Hook's statement opens the possibility that the White House may be willing to alter its stance on what it demands from Iran. A narrow agreement over ballistic missiles and the nuclear program would mark a shift from the 12 conditions that the United States set out for Iran before removing the crippling economic sanctions that Washington reinstated after withdrawing from the Joint Comprehensive Plan of Action (JCPOA), as the nuclear deal is commonly known, in May.