Here is what the fourteenth amendment says:

Representatives shall be apportioned among the several states according to their respective numbers, counting the whole number of persons in each state, excluding Indians not taxed.

Congress is free to say who is actually “in each state”. Under the current rules, a foreign tourist is not counted unless they violate federal law and overstay their visit. Congress simply needs to change the law to classify non-citizens without permanent residency status as “visitors”.

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