US envoy George Mitchell (C) leaves the presidential palace in Damascus after his meeting with Syrian President Bashar al-Assad on June 13, 2009. Mitchell, the highest ranking official to visit Syria since President Barack Obama took office in January, is in Damascus on the the latest leg of a regional tour. He met Assad as Obama's administration steps up efforts to bring peace to the Middle East. Getty Images logo Getty Images 5 months ago

US envoy George Mitchell (C) leaves the presidential palace in Damascus after his meeting with Syrian President Bashar al-Assad on June 13, 2009. Mitchell, the highest ranking official to visit Syria since President Barack Obama took office in January, is in Damascus on the the latest leg of a regional tour. He met Assad as Obama's administration steps up efforts to bring peace to the Middle East.