The U.S. ambassador to Iraq, Zalmay Khalilzad, has said in the past that he is ready to talk with the Iranians about Iraq.
Mottaki's visit to Iraq is the first by a top Iranian official since Iranian President Mahmud Ahmadinejad's election victory in June 2005. The United States has not had formal diplomatic relations with Iran since 1979.
(Reuters, AFP, AP)