A year ago, U.S. President Donald Trump withdrew from the Iran nuclear deal on the grounds that he wanted a bigger, better agreement. Criticizing the Joint Comprehensive Plan of Action (JCPOA) for its limited scope and scale, Trump has called for a deal that would impose longer-lasting, more stringent restrictions on Iran’s nuclear work, while limiting Tehran’s ballistic missile program and stemming its interference in neighboring countries. To get to such a grand bargain, the Trump administration has pledged to enlist the support of regional players as well as Congress.

How viable is Trump’s ambitious plan? Together with colleagues at Chatham House, I took this question, among others, to 75 analysts and policymakers in ten countries: the United States, Iran, the United Kingdom, France, Germany, Israel, Russia, China, the United Arab Emirates, and Saudi Arabia. Respondents assessed the possibility that the United States could yet broker a grand bargain with Iran. They also answered questions relating to the nuclear, regional, and ballistic missile issues that have been under negotiation.