TEHRAN, Iran — A radical cleric called Saturday for the creation of a “Greater Iran” that would rule over the entire Middle East and Central Asia, in an event that he said would herald the coming of Islam’s expected messiah. Ayatollah Mohammad Bagher Kharrazi said the creation of what he calls an Islamic United States is a central aim of the political party he leads called Hezbollah, or Party of God, and that he hoped to make it a reality if they win the next presidential election. Kharrazi’s comments reveal the thinking of a growing number of hard-liners in Iran,...