The Philippines is a unitary state with some powers devolved to Local Government Units (LGUs) under the terms of the Local Government Code. There is also one autonomous region, the Autonomous Region of Muslim Mindanao. Over the years various modifications have been proposed to the Constitution of the Philippines, including possible transition to a federal system as part of a shift to a parliamentary system. In 2004, Philippine President Gloria Macapagal Arroyo established the Consultative Commission which suggested such a Charter Change but no action was taken by the Philippine Congress to amend the 1987 Constitution.