The top judge at Egypt’s Supreme Constitutional Court, Adli Mansour, was sworn in Thursday as the country’s interim president, taking the helm a day after the military ousted Islamist president Mohammed Morsi from power in a rout that prompted mixed reactions from world leaders. The head of the armed forces, General Abdel Fattah al-Sisi, announced Morsi’s overthrow on state television late Wednesday following the expiration of a 48-hour army ultimatum. The sudden change of leadership brought expressions of joy and concern from different quarters, with Turkish Foreign Minister Ahmet Davutoğlu calling the coup “unacceptable” while Qatar’s new emir, Sheikh Tamim...