"On July 14, 2015, Iran and the six powers that negotiated with Iran about its nuclear program since 2006 (the United States, the United Kingdom, France, Russia, China, and Germany-- collectively known as the P5+1) finalized a Joint Comprehensive Plan of Action (JCPOA). The JCPOA required constraints that seek to ensure that Iran's nuclear program can be used for purely peaceful purposes in exchange for a broad lifting of U.S., European Union (EU), and United Nations (U.N.) sanctions on Iran. [...] Officials from both the Barack Obama and Donald Trump Administrations have certified that Iran is abiding by its JCPOA commitments. [...] Top Trump Administration officials have argued that the JCPOA does not address Iran's 'malign' activities in the region and any other activities that the Administration considers provocative or destabilizing, such as the continued development of ballistic missiles. Administration officials have also said that these weaknesses in the agreement might lead the Administration to conclude that the JCPOA is not adequately serving U.S. interests. Yet, P5+1 and other U.S. allies argue that the agreement contributes to regional stability and that the United States should continue to implement it. [...]In the 114th and 115th Congresses, legislation has been introduced with the stated purpose of redressing asserted weaknesses of the deal or preventing any U.S. sanctions relief beyond that explicitly promised in the JCPOA.'"
CRS Report for Congress, R43333