Iran and the Group 5+1 (the US, Russia, China, France and Britain plus Germany) reached the JCPOA on July 14, 2015 and began implementing it in January 2016.
Under the agreement, limits were put on Iran’s nuclear activities in exchange for, among other things, the removal of all nuclear-related bans against the Islamic Republic.
The UN Security Council later unanimously endorsed a resolution that effectively turned the JCPOA into international law.
Trump has been a virulent critic of the JCPOA signed under his predecessor Barack Obama, calling it 'the worst deal ever.'
However, the US Senate and Treasury Department have imposed new sanctions against Iran and several Iranian companies and individuals in recent months over its national missile program, which is not in breach of the JCPOA.
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