Making laws
Origination Clause
Article I, Section 7: all bills for raising revenue must start in the House. The Senate may amend them freely, including by replacing the entire text.
In full
The clause gave the chamber elected directly and most often the first word on taxation. In practice the Senate's power to amend has hollowed it out: the Senate can take a House-passed revenue bill, strike everything after the enacting clause, and substitute its own, a shell game the House answers with the blue slip when it objects.
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A plain-language explanation for civic education, not legal advice. When in doubt, the official source named above controls.