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ProminentÌýIraqi ShiaÌýcleric said on Thursday that he was stepping back for the next 40 days and giving his Iran-backed rivals the chance to form the country's next government.

The surprising move by Al-Sadr comes against the backdrop of a persisting in Iraq, five months after general elections.

Al-Sadr's offer came in a tweet, in which he also called on his followers not to interfere "neither positively norÌýnegatively"Ìýas his rivals form the Coordination Framework, a coalition of Iran-backed ShiaÌýparties, try to cobble together a Cabinet.

— مقتدى السيد محمد الصدر (@Mu_AlSadr)

This translates into a nod to Al-Sadr's rivals to pursue the cleric's Kurdish and Sunni allies in possible negotiations. There was no immediate response from the Coordination Framework to Al-Sadr's offer.

Iraqi political parties are at an impasse, and Al-Sadr- he winner of the election- has been unable to form a coalition government. He has assailed his rivals, saying they "obstructed and are still obstructing"Ìýthe process.

The parties are at for president, an obstacle that may also extend to the premiership. It is also not clear which party constitutes the largest bloc in parliament because of unclear and shifting loyalties of some lawmakers and parties.

The 40-day window offered by Al-Sadr would start on the first day of the Muslim holy month of Ramadan, expected to begin this weekend, depending on the sighting of the new moon.

The Islamic calendar is a lunar one, meaning the timeframe offered by Al-Sadr would stretch beyond , when observant Muslims fast from dawn to dusk.

The development is "a clear challenge and dare" directed at his rivals while also being a "test of partners,"Ìýtweeted Farhad Alaaldin, chairman of the Iraq Advisory Council, a policy research institute.

It was not immediately clear how sincere Al-Sadr's offer was. The cleric, with a strong grassroots base, won the largest number of seats in the election but not enough to declare a parliamentary majority.

Iran-aligned parties, including that belonging to former Prime Minister , have become his chief rivals. A parliament session last Saturday failed to reach the two-thirds quorum necessary to elect a president. It was largely boycotted by lawmakers associated with the Coordination Framework.

Al-Sadr's move is a gamble: A failure by the Coordination Framework would give his party, Sairoon, significant leverage, but its success would relegate Al-Sadr's party to the role of the opposition.