How can a President use a line-item veto?

Question

anonymous · Answer

"The line-item veto is a special form of veto that authorizes a chief executive to delete particular provisions of a bill enacted by a legislature without vetoing the entire bill." - Wikipedia

As the name implies, the President vetoes individual lines or items but not the entire bill.  As a result, a bill can sometimes end up being passed but after being severely being waterdown to a point where's its pointless.  This may help attempt to appease supporters of a bill by passing it while appeasing to opponents of said bill by watering it down

anonymous · Answer

He can't.  The line-item veto is unconstitutional.  If you change your question to the subjunctive mood ("How could a President use a line-item veto?") then the answer is as above.