Making laws
rider
An unrelated provision attached to a bill likely to pass, often a must-pass spending bill, to carry it into law.
In full
A rider hitches a policy that could not pass on its own to a vehicle that cannot be allowed to fail. Appropriations bills attract riders because the government shuts down without them. The House's germaneness rule limits riders there; the Senate's looser amendment rules and the end-of-year rush make them a fixture of big omnibus packages.
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A plain-language explanation for civic education, not legal advice. When in doubt, the official source named above controls.