Iran's supreme leader ordered the Guardian Council to investigate the candidate's claims of electoral fraud. But the council is headed by a cleric cut from the same cloth as President Ahmadinejad.
Street clashes between security forces and supporters of challenger Mousavi picked up after dark on Sunday after President Ahmadinejad addressed thousands of his supporters in Tehran.
President Ahmadinejad's bellicose rhetoric has raised concerns about Iran's intentions. Whether or not he is reelected Friday, here's what Western policymakers now need to consider.
Voters flocked to the polls to weigh in on the country's faltering economy and aggressive foreign policy.
Supporters of challenger Mir Hossein Mousavi clash with riot police and Hizbullah vigilantes.
Tens of thousands have rallied in favor of Ahmadinejad challenger Mousavi ahead of June 12 election.
The Western-backed March 14 coalition won an unexpectedly large parliamentary majority – 71 of 128 seats – over the opposition, led by the Iranian-backed militant group.