[Repeal The 17th]

US CONSTITUTION - Article I - Section 8
The Congress shall have power to:
establish a uniform rule of naturalization, and uniform laws on the subject of bankruptcies throughout the United States.
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Amendment 14 - Section 5
The Congress shall have power to enforce, by appropriate legislation, the provisions of this article.

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As I understand this and other commentary I have read,
congress can simply define citizenship as they may seem fit.
No constitutional amendment is needed; just a congressional bill.

[RobbyS]

I agree.