President Rohani’s second term is going from bad to worse. With the return of US sanctions hammering the economy and his economy and finance minister impeached, he has now suffered the indignity of being grilled by parliament.

President Hassan Rohani was summoned to parliament on 28 August for questioning – following his predecessor Mahmoud Ahmadinejad as only the second sitting president forced to appear before parliament in the Islamic Republic’s history. The...