For much of his presidency, Hassan Rouhani has been at loggerheads with Iran’s military and conservative establishment, as he forged diplomatic ties with the West to break his country’s international isolation. But now with his political survival in question, Mr. Rouhani is sounding a lot like Iran’s hard-liners. During a visit to Switzerland last week, Mr. Rouhani responded to U.S. plans to enforce a global freeze on Iranian oil exports by threatening to disrupt the flow of Middle Eastern oil through the Persian Gulf. It was seen as a warning to the world that Iran could block the Strait of Hormuz, a waterway for about one-third of global seaborne oil trade—a threat made before by Iran’s military, but not by Mr. Rouhani. Iranian President Rouhani’s political fortunes largely rest with Supreme Leader Ayatollah Ali Khamenei, shown here in 2015 with the commander of Iran’s Quds Force, Maj. Gen. Qassem […]