"Iranian voters go to the polls on May 19, 2017, to vote for president and municipal officials countrywide amid tensions between Iran and the United States. On April 19, the Trump Administration certified to Congress, pursuant to the Iran Nuclear Agreement Review Act (INARA, P.L. 114-17), that Iran is complying with the 2015 multilateral nuclear agreement (Joint Comprehensive Plan of Action, JCPOA). [...] Any outcome will have significant implications for U.S. policy. Even though all the candidates have described the JCPOA as an established fixture and would be likely to continue implementing it, a more hardline president might discontinue Rouhani's efforts to promote diplomatic engagement with the West. A hardline president might also try to remove even those few restraints Rouhani has managed to impose on actions that U.S. officials characterize as provocative."
CRS Insight, IN10699
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html