Prime Minister Imran Khan of Pakistan said on Tuesday that U.S. President Donald Trump had asked him to help defuse tensions with Iran and that he had already spoken with Iranian President Hassan Rouhani in an attempt to mediate. The United States blames Iran for an attack on the world’s biggest crude oil processing facility in Saudi Arabia on Sept. 14 and has said they will present evidence to back that up. Yemen’s Iran-aligned Houthi group, which has been fighting a Saudi-led military coalition since 2015, has claimed responsibility.