The United States has recently imposed new sanctions on six Iranian firms for their part in developing a ballistic missile program. This comes after Iran tested a rocket capable of placing objects in orbit. Trump says the missile tests violate the JCPOA. Rouhani has threatened to leave the JCPOA if more sanctions arise.
RUSI| August 9, 2017
For all the Sturm und Drang over the Joint Comprehensive Plan of Action (JCPOA) with Iran, neither side has answered the crucial question the Trump administration faces if it abrogates the deal: 'And then what?'
Reuters | August 15, 2017
"If America wants to go back to the experience (of imposing sanctions), Iran would certainly return in a short time -- not a week or a month but within hours -- to conditions more advanced than before the start of negotiations," Rouhani told a session of parliament broadcast live on state television.