The Sunni bloc is leaving because Maliki won't grant their demands. By Mariam Karouny and Paul Tait for [1] Reuters:

BAGHDAD (Reuters) - The main Sunni Arab political bloc quit the Iraqi government on Wednesday in a blow to Prime Minister Nuri al-Maliki, while a suicide bomber driving a fuel truck killed 50 people in one of several car bombs in Baghdad.

The Sunni Accordance Front announced its pull-out from Maliki's Shi'ite-led coalition over his failure to meet a list of about a dozen demands, including a greater say in security matters.

The front's 44 members will remain in the 275-seat parliament. Its withdrawal will have little practical effect on the 15-month-old government, which is virtually paralyzed by infighting but needs only a simple majority to keep functioning.

But the shaky coalition is under pressure from the United States and its allies to end sectarian strife between Shi'ites and Sunnis through national reconciliation.