On Sunday, Iranian President Hassan Rouhani cautioned U.S. President Donald Trump about pursuing hostile policies against Tehran, saying “America should know war with Iran is the mother of all wars. According to Reuters, Rouhani did not rule out peace between the two countries, either. Addressing a gathering of Iranian diplomats this weekend, Rouhani said: “Mr Trump, don’t play with the lion’s tail, this would only lead to regret.