Since 1995, the United States has had an embargo on trade with Iran. In 2015, the United States led successful negotiations for a nuclear deal (the Joint Comprehensive Plan of Action) intended to dismantle Iran's nuclear weapons capabilities, and when Iran complied in 2016, sanctions on Iran were lifted. The Trump administration withdrew from the nuclear deal and re-imposed the sanctions in 2018. Since this time, relations between the United States and Iran have worsened, and the two countries came close to conflict during the 2019–20 Persian Gulf crisis.