According to the AP, Mousavi also asked Iran's top legislative body, the Guardian Council, to annul the result. The Guardian Council, whose chairman, Ayatollah Ahmad Jannati, endorsed the president prior to the vote, has said that it will rule on the matter within 10 days.
Meanwhile, Iran's supreme religious leader, Ayatollah Ali Khamenei, the most powerful man in the country, declared the election fair and ordered Iranians to respect the result.
But, according to the AP, Iranian state television reported that Ayatollah Khamenei has ordered an investigation into the claims of election fraud. The contradictory reports make it difficult to verify what is and isn't misinformation.
Across the country, the government continued to block text-messaging as well as access to YouTube and Facebook, which opposition supporters had used to organize demonstrations.
What they didn't block was Twitter, which protesters then took advantage of to attack the government and share information about the crackdown.
In Iran itself, the situation continues to be volatile. Today, in Moscow, the Iranian Embassy said Ahmadinejad has put off a visit to Russia and said it was unclear whether the president would travel at all. Ahmadinejad had been expected to visit the Russian city of Yekaterinburg and meet with Russian President Dmitry Medvedev on the sidelines of a regional summit.
ABC's Jake Tapper, Lara Setrakian and The Associated Press contributed to the reporting of this story.