"In Clinton v. City of New York, the Supreme Court found that the line-item veto violated the Presentment Clause of the Constitution, which says that the president does not have the power to unilaterally amend or repeal legislation passed by Congress."
However, in the case of “Obama vs. America”, apparently it was found constitutional for some presidents, depending on party and race, to do whatever they like.
huh?
Repeat: Line item veto would require a Constitutional amendment.