http://www.gwu.edu/~nsarchiv/NSAEBB/NSAEBB252/index.htm:
Recently declassified documents show that the U.S. military has long sought an agreement with Baghdad that gives American forces virtually unfettered freedom of action, casting into doubt the Bush administration's current claims that their demands are more limited in scope.
Democracy Now
quotes Nouri al-Maliki:
When we started the talks on August 26, we wanted an agreement between two completely sovereign countries, and when we went to the pact, we found that the US demands hugely infringe on the sovereignty of Iraq, and this we can never accept. We can’t extend the US forces permission to arrest Iraqis or to undertake the responsibility of fighting terrorism in an independent way or to keep Iraqi skies and waters open for themselves whenever they want.