RNA - Sadr was asked on Saturday about Washington's indirect contact with his Sairoon (Marching Towards Reform) bloc through some of the alliance's members about the formation of a new Iraqi government.
The cleric responded that he had already addressed the issue in one of his tweets.
"We are a nation whose principles and positions have not changed and will not change," Sadr's official website quoted him as saying.
Iraq's parliamentary elections were held on May 12.
Sadr's Sairoon bloc won 54 out of 329 seats in the Iraqi parliament. The Fatah (Conquest) alliance, led by secretary general of Badr Organization Hadi al-Ameri, and incumbent Prime Minister Haider al-Abadi's Nasr (Victory) coalition finished second and third with 47 and 42 seats, respectively.
Negotiations are underway between Iraqi parties to form the new government.
Erdogan, Sadr speak on phone
Late Friday, Turkish President Recep Tayyip Erdogan congratulated Sadr on his election victory.
During a telephone conversation, Erdogan wished Sadr well on forming the new government and highlighted Ankara's support for Iraq's unity, according to Turkish presidential sources.
Erdogan also demanded an investigation into suspected voting irregularities in Turkmen areas of Iraq's Kirkuk province.
Iraq probes voting irregularities
Separately on Friday, Abadi ordered the creation of a high-powered commission to look into the alleged irregularities in the parliamentary elections.
According to Press TV, an official statement said a recent cabinet meeting chaired by the premier had named the Iraqi anti-graft chief as the head of the commission.
The statement further suggested that hackers may have manipulated the election results.
There have been complaints about irregularities at some polling stations linked to a new electronic voting system in Iraq.
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