Iran's former nuclear negotiator accused Iranian President Mahmoud Ahmadinejad of touting the country's nuclear successes to make himself look like a hero ahead of next week's election.
Hasan Rowhani also called the president a "demagogue" whose hard-line policies have harmed Iran's dignity and credibility abroad.
The criticism was part of verbal dueling ahead of the June 12 presidential election.
Ahmadinejad faces a tough challenge from three other contenders - including two reformists - for the country's top job.
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