The summit of Arab neighbors Tuesday is the third attempt to gain more support for Iraq's reconstruction from Sunni states. Baghdad's crackdown on Shiite militias may help.
Secretary of State Rice arrived in Baghdad on Sunday as Iraqi, US, and British forces continued to clash with the Mahdi Army.
US forces hope that the wall will reduce militia attacks, allow for reconstruction.
The British CBS reporter had been held for two months in the southern Iraq city of Basra.
American forces in Iraq announced Monday ambitious public-works plans to win support in Sadr City.
US and Iraqi forces have been battling Moqtada al-Sadr's Mahdi Army there since March 25.
In an interview, a member of the Islamic Army of Iraq speaks of his group's long-term goals.
Iraq's oil minister says the assault helped curb oil smuggling.