US President Donald Trump says he's imposing a 25% tariff on goods from countries doing business with Iran, ratcheting up pressure on the government in Tehran. The announcement comes after weeks of mass unrest in Iran, initially sparked by worsening economic conditions, but has increasingly been aimed at the regime. William Roebuck, former US Ambassador to Bahrain and Executive Vice President, Arab Gulf States Institute spoke to Bloomberg’s Horizons Middle East and Africa anchor Joumanna Bercetche on the future of the regime. (Source: Bloomberg)