Abdallah Maki Mosleh al-Rifai, or “Abu Khadija,” was “deputy caliph” of the militant group and “one of the most dangerous terrorists in Iraq and the world,” the statement said, as reported by CNN. Abdallah Maki Mosleh al-Rifai, or “Abu Khadija,” was “deputy caliph” of the militant group and “one of the most dangerous terrorists in Iraq and the world,” the statement said, as reported by CNN.