Qatar's Emir Sheikh Tamim bin Hamad Al Thani arrived in Tehran on Sunday, amid a rising tension between Iran and the U.S. following the killing of an Iranian general in a drone airstrike. According to a statement by the Qatari Royal Court, Tamim will hold talks with Iranian President Hassan Rouhani and senior officials on bilateral relations and regional developments. The Qatari leader will also meet with Iran's Supreme Leader ...