Trita Parsi, the author of a new book on US-Iran relations, Losing an Enemy: Obama, Iran, and the Triumph of Diplomacy, said that Trump was likely to respond by increasing pressure on Iran through imposing new sanctions and encouraging other Arab countries to stop trading with Iran, rather than relying on diplomacy. “So far all we’ve seen from the Trump administration is a focus on pressure; there’s no focus on diplomacy,” he said.