Necessary and proper
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Necessary and proper constitutional
Congress can pass laws that are genuinely useful for carrying out its listed powers — not only ones that are absolutely essential.
Technical: The Necessary and Proper Clause (Art. I, §8, cl. 18) lets Congress make laws 'necessary and proper' to execute its enumerated powers; McCulloch v. Maryland, 17 U.S. (4 Wheat.) 316 (1819), read 'necessary' to mean convenient/useful, not indispensable.
Founding-era note: The scope of 'necessary' was contested at the Founding (Jefferson's strict reading vs. Hamilton's broad reading); Marshall's McCulloch opinion adopted the broad reading.
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