Illegal aliens should not be part of the census for representation.
Not to disagree with you but the Constitution requires counting persons. It says nothing about counting only citizens. Of course the Founders never imagined an uncontrolled invasion on the scale we’re experiencing. But then there are a lot of things about modern America that the Founders would have a lot of trouble believing.
I would take it up to SCOTUS, if possible. I think you are right, but also think that persons have to be those here legally, whether they were slaves, on visas, etc, over history.