Repealing an existing amendment by enacting a new one--which is really how an amendment gets repealed--still requires passage by 2/3rds of both houses of Congress and ratification by 3/4ths of the states. The founders made it hard to amend the Constitution--on purpose.
Now, if you were to say that Congress should repeal the ordinary laws that make the parents of anchor babies eligible for the various reliefs from deportation, that's a different story.
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