Iraq Security Agreement Act of 2008 - Directs the President to report annually to the appropriate congressional committees respecting U.S. security commitments to, and arrangements with, other countries.
Directs the Secretary of State and the Secretary of Defense to consult with the appropriate congressional committees respecting negotiations pursuant to the Declaration of Principles between the United States and Iraq.
Prohibits any agreement (or the obligation of implementing funds) containing a security commitment to, or security arrangement with, the Republic of Iraq, from entering into force except pursuant to Article II, section 2, clause 2 (relating to treaties) or Article I, section 7, clause 2 (relating to enactment of laws) of the Constitution of the United States.