What is the primary reason that American presidents do not exercise the power of a line-item veto?

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The primary reason that American presidents do not exercise the power of a line-item veto is that the Supreme Court has ruled that such a power would require an amendment to the Constitution. In the 1998 case of Clinton v. City of New York, the Supreme Court declared the Line Item Veto Act of 1996 unconstitutional. Therefore, despite previous attempts to grant the president line-item veto power, the Supreme Court has determined that it would require a constitutional amendment to be enacted.

What Is the Primary Reason That American Presidents Do Not