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In public policy, a sunset provision is a specification in a law that makes it no longer effective after a specific date, unless further legislative action is taken to extend it.
A sunset provision became an issue in the United States 2004 presidential election when Sen. Joe Lieberman criticized Pres. George W. Bush for saying the ban on assault weapons should be extended, but failing to urge Republicans in Congress to take the necessary action to keep the ban from sunsetting.