The constitutional procedure by which the President refuses to approve a bill or joint resolution, and thus prevents its enactment into law. A regular veto occurs when the President returns the legislation to the originating House without approval. It can be overridden only by a two-thirds vote in each House. A pocket veto occurs after Congress has adjourned and is unable to override the President's action. The President may also choose to disapprove only particular items of a bill without having to disapprove the entire bill, which is called a line-item veto.
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