A measure can either be approved by the president and signed into law, or it can be rejected (veto). The majority of the time, Congress can vote to override the president's veto of a measure, making it law.
The veto is the president's authority to reject a bill or joint resolution and halt its passage into law. A law that Congress has enacted must be signed by the president within 10 days (excluding Sundays). In the case of a conventional veto, the President sends the piece of legislation back to the house where it was first introduced, usually with a message outlining his or her reasons. Only a two-thirds vote in both the Senate and the House is required to override this veto. In this case, despite the President's objections, the bill becomes a law. When Congress adjourns during the ten-day timeframe, a pocket veto happens. The bill cannot be sent back to Congress by the president. A pocket veto is the president's choice not to sign the bill.
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