Iran, OPEC's second largest oil producer, is in the grip of a domestic political crisis that has pitted hardline President Mahmoud Ahmadinejad against Supreme Leader Ali Khamenei. Having secured a second term in office in 2009 with Khamenei's support, Ahmadinejad's sacking of ministers in defiance of Khamenei's orders has put him on a collision course with Iran's powerful clerical establishment.
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