Former Iranian Prime Minister and a candidate for presidency, Mir-Hossein Mousavi accuses President Mahmoud Ahmadinejad of being a radical, particularly in foreign policy.

He levelled these allegations Monday at a news conference in Tehran.

Mousavi said Ahmadinejad's radical policies severely harmed our national interests.

Extremism brings heavy costs for us, such as chanting harshly-worded slogans and, at the same time, talking about friendship with the Israeli nation, he said.

Referring to Ahmadinejad's letters sent to the U.S., German and French heads of state, he stressed the need for modifying the anti-western slogans and rhetoric.

Mousavi, 68, was Prime Minister from 1981 to 1989, when the post was scrapped from the Iranian constitution and the president became the main head of executive power.

Mahdi Karroubi, a leading moderate, is also challenging Ahmadinejad in the June 12 presidential elections.

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