Exiting the Iran nuke deal is no simple matter. The reality is that since the deal’s adoption, the European countries have broadened their economic ties to Iran, ties that would be at risk if the US began a new sanctions regimen.
Under the accord’s dispute resolution mechanism, any party to the deal may treat an “unresolved issue” as grounds to “cease performing its commitments under the JCPOA” while the issue moves to the UN Security Council for review. The council then has a month to resolve the issue. If it can’t, all the multilateral sanctions lifted under the JCPOA resume, in effect killing the deal.
“It would be perceived as such an aggressive step by the Europeans that in a universe where presumably the administration is trying to balance … competing priorities, they would at least think twice about doing that,” Blanc said.
https://www.al-monitor.com/pulse/originals/2018/04/trump-threat-blow-up-iran-deal-options.html
THE ABYSS BECKONS! 