The latest round of Iran nuclear talks is under way with the March 31st deadline for a framework agreement rapidly approaching. Middle East analysts say Iran's supreme leader, 75-year-old Ayatollah Ali Khamenei, is likely to have the final say on whether or not the country accepts a nuclear deal, if one is reached. VOA correspondent Meredith Buel reports on the man considered to be the most powerful political authority in the Islamic Republic.
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