We tried it, and look where it got us.

Bush warns Iran against action in Iraq

And, getting in on the general merriment, National Security Council spokesbimbo Gordon Johndroe says, "if Iran wants to quit playing a destructive role in the affairs of Iraq and wants to play a constructive role, we would certainly welcome that," stopping short of saying we would never think of playing a destructive role in the affairs of Iraq - which, of course, we wouldn't. Unless you want to call dropping bombs and stuff like that "destructive," ha ha ha. That's just getting ready to start constructing, is all.