Originally Posted by SteveZ

The "signing statements" only indicate that the Executive Branch views a particular provision as unconstitutional, and as such does not plan to be bound by that provision. If the Executive Branch does not follow any particular provision, the EB is subject to suit, but who's going to sue? Depending on the provision, the battle could last longer tha the administration's term - and who's willing to belly up the money for the suit?

As far as "line item veto," I hope it never comes to pass, and would appear to take a Constitutional Amendment to make it happen. Congress cannot autocratically change the Executive's authority, and I doubt SCOTUS would rule that any Congressional action for a line item veto as being unconstitutional.