Official policy changes ` ` necessary , essential and appropriate '' to the new agreement . Status - of - forces pact would set terms for U.S. presence in Iraq after U.N. mandate ends . U.S. has expressed ` ` great reluctance '' to change pact but has n't ruled out renegotiations . BAGHDAD , Iraq ( CNN ) -- Thousands of students protest status - of - forces pact Tuesday at university in Baghdad .
Official policy changes ` ` necessary , essential and appropriate '' to the new agreement . Status - of - forces pact would set terms for U.S. presence in Iraq after U.N. mandate ends . U.S. has expressed ` ` great reluctance '' to change pact but has n't ruled out renegotiations . Thousands of students protest status - of - forces pact Tuesday at university in Baghdad .