The Iraqi government seems to be eyeing a long-term American military presence.
If I'm a Democrat running for Congress or the White House, the "Oh, crap!" meter is running very high at this news. If there is this formal request that the United States of America maintains a long-term presence in Iraq, it becomes much harder for the Dems to please their political base. It would put them in line with Muqtada al-Sadr as well as Iran and Syria, but that would be it.
Oh, and they would be leaving an ally in the lurch. Typical of them (see their treatment of Colombia under President Uribe), but it won't play well here, especially if the declaration of intent becomes public.