The balloting last Friday in Iran was not an election pitting "hard-liner" Ahmadinejad against "reformist" Mousavi.
Defence lawyers alleged that Mohammed and Mousavi were interrogated by Israeli security officers while in detention.
Reformist candidates Mir Hossein Mousavi and Mehdi Karroubi were detained and remain under house arrest.
My feeling is that whatever Mir Hossein Mousavi says, the people will gather for this demonstration.
Mr Mousavi will turn up, as will defeated candidate Mehdi Karroubi and former President Khatami.
Mr Mousavi served as prime minister during the years of the Iran-Iraq war from 1980-1988.
Mr Mousavi, a reformist former PM, says he would seek to disband the force.
The official results gave President Ahmadinejad 63% of the vote against 34% for Mr Mousavi.
Instead those disparate groups of discontented Iranians united behind the main challenger, Mr Mousavi.
In the rare debate, Mousavi responded by arguing that Ahmadinejad's dictatorial ways have tainted Iran's image.
The majority of MPs are conservative, certainly not Mousavi supporters, but also quite hostile to President Ahmadinejad.
"They just want Mousavi because he told them he will give them freedom, " said one Ahmadinejad supporter.
For women backing Mr Mousavi, or the other reformist candidate Mehdi Karroubi, they know equality has limits.
Mr Mousavi, a leader of the Green Movement, lost to Mahmoud Ahmadinejad in the 2009 presidential election.
Then administration spokespersons panted to take credit for the "inevitable" election of Mir Hossein Mousavi in Iran.
Opposition leaders Mir Hossein Mousavi and Mehdi Karroubi have said elections in June were rigged against them.
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Mr Mousavi had become the representative of protesters on the streets who, he said, had displayed "extraordinary courage".
The main opposition figures - Mir Hossein Mousavi, Mehdi Karroubi, Mohammed Khatami - all support Iran's nuclear ambitions.
" An adviser to Mr. Mousavi tells me that "They wanted to make an omelet without breaking eggs.
The authorities had earlier sealed off Mr Mousavi's campaign HQ, preventing his supporters from holding a news conference.
Ahmadinejad accused Mousavi and the two former leaders of standing against the Iranian nation and conspiring against him.
Correspondents consider Mr Mousavi the main reformist challenger to President Mahmoud Ahmadinejad , who is seeking another term.
On February 24, the mullahs reportedly arrested opposition leaders Mir Hossain Mousavi and Mehdi Karroubi along with their wives.
Whether he had planned to do so or not, a week ago Mousavi became an enemy of the regime.
Newspapers may no longer mention Messrs Mousavi and Karroubi, and the country's biggest liberal political party has been banned.
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Mohamed and Mousavi were arrested in June 2012 and charged with possessing 15kg (33 pounds) of the powerful explosive RDX.
One of the remaining reformist candidates, Mir Hosein Mousavi, is seen as capable of attracting conservatives as well as liberals.
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Mousavi frames his reforms as an affirmation of Iran's constitution, which he says has been "violated and undermined" by Ahmadinejad.
The fact of the matter is that with each passing day, Mousavi's personal views and interests are becoming increasingly irrelevant.
He had said either he or former Iranian Prime Minister Mir Hossein Mousavi would run as the reformist candidate in June.
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