Tehran  - Incumbent Iranian President Mahmoud Ahmadinejad rejected Saturday all criticisms against the current administration raised by his challengers in next month's presidential elections threatening them to reveal their past performances.

Ahmadinejad's rivals in the June 12 elections, the two moderate candidates Mir-Hossein Moussavi and Mehdi Karroubi as well as the conservative candidate Mohsen Rezaei, have repeatedly criticized the president's economic and foreign policies blaming him for weakening the economy and putting the country in a renewed international isolation.

"They have made two mistakes: firstly distorting the image of other candidates is against the law and is considered a crime; secondly they would not be able to prove many of their allegations against the government," official news agency IRNA quoted Ahmadinejad as saying in news conference in Tehran.

"Their past managerial records are available - and as long as they behave like this, we would then be forced to reveal them to the public," Ahmadinejad continued.

Ahmadinejad is accused of not fulfilling his economic promises on improving the life standards for the middle class and poorer social strata and is also blamed for his harsh rhetoric in foreign policy particularly anti-Israeli comments which his challengers believe were improperly expressed and were unnecessarily harsh.

His anti-Israeli comments sparked worldwide outrage when he blatantly threatened to wipe Israel off the map of the Middle East and expressed doubt over the extent of the Holocaust, describing the mass killing of Jews in World War II as a "fairy tale."

Ahmadinejad - one of the four presidential candidates approved Wednesday by the powerful Iranian constitutional watchdog, the Guardian Council - was largely unknown when he unexpectedly became Iran's president in June 2005. (dpa)