Iraqi political leaders are continuing efforts to win support from Sunni Arabs for a new constitution, before Saturday's national referendum on the draft.
Iraq's majority Shi'ites and Kurds support the draft, but minority Sunni Arabs oppose it, fearing that they will be sidelined under the proposed federal system.
In another development, Iraq's anti-corruption commission says arrest warrants have been issued for some two dozen officials from the previous interim government of Prime Minister Iyad Allawi.
The commission says the former senior officials, including former defense minister Hazem al-Shaalan, are suspected of embezzling more than $1 billion from military procurement funds.
Many of the accused are said to have left Iraq since the Allawi cabinet was replaced by an elected transitional government in April.