The US government must certify compliance to Congress every ninety days and the next deadline ends in October. Clearly, the Trump administration is looking very hard. The article highlights that the Obama negotiated deal has given Iran enormous relief from economic sanctions, despite continuing to support terrorism.
Reporting on the main terms of the Iran nuclear deal the BBC highlights:
Should Iran violate any aspect of the deal, the UN sanctions will automatically “snap back” into place for 10 years, with the possibility of a five-year extension.
What is not clear is how US decertification will be received by other parties to the agreement, namely Britain, France, Germany, Russia, China and the United Nations. Of course, there is also the reaction from Iran.