A slew of former Obama officials, including Kerry, Obama’s Middle East advisor Robert Malley, and Obama-era Secretary of Energy Ernest Moniz, met with Zarif during the Trump years. Kerry, Malley, and Moniz led negotiations in the 2015 Joint Comprehensive Plan of Action (JCPOA), in which the U.S. provided sanctions relief and access to tens of billions of dollars in frozen bank accounts in exchange for Iran’s promises to limit nuclear enrichment. Trump pulled the U.S. out of the deal in 2018, citing the need for a tougher agreement that also addressed Iran’s support for terrorist groups and its destabilizing behavior...