Mousavi insists that Iran's disputed June 12 election was riddled with fraud. He contends that he - not incumbent President Mahmoud Ahmadinejad - was the rightful winner.
But Iran's powerful Guardian Council proclaimed the election results valid earlier this week, and the regime since has stepped up efforts to isolate and discredit Mousavi.
Earlier Wednesday, the feared Basij militia asked a prosecutor to investigate Mousavi's role in two weeks of violent protests.
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