The meeting will bring together President Jalal Talabani, who is Kurdish, Shi'ite Prime Minister Nuri al-Maliki, and Sunni Vice President Tariq al-Hashimi.
Sunni Arab ministers in the government have stopped attending cabinet meetings, while Shi'ite ministers loyal to radical Shi'ite cleric Muqtada al-Sadr have left the government.
The meeting comes a day after a car bomb attack in central Baghdad killed 25 people and wounded 115.
Meanwhile, clashes broke out early today between U.S. forces and militiamen of al-Sadr's Imam Al-Mahdi Army in the city of Karbala, south of Baghdad.
At least three militiamen have been killed in the fighting.