I know that the liberals consider anchor baby citizenship to be settled science, but has this ever been subject to a ruling by the Supreme Court? I would think this might kick off another round of debates about census results and representation in the House. Just asking.
Short answer is no, not really. Here is the best primer on birthright citizenship:
Birthright Citizenship: An Overview
By raising the possibility of limiting birthright citizenship by executive order, President Trump has brought to the fore an as-yet-unresolved legal issue: whether a child born to an alien unlawfully present in the United States automatically becomes a U.S. citizen at birth under the Fourteenth Amendment. Inevitably, if the president were to take such action, it will be up to the Supreme Court to resolve this issue, once and for all.
If the Supreme Court were to find that under the Fourteenth Amendment, children of aliens unlawfully present in the United States do not automatically receive U.S. citizenship at birth, U.S. law would be brought in line on this issue with the policies of many of our major allies, and many other industrial powers. The taxpayers of the United States would also save the costs of providing government benefits to those erstwhile U.S. citizens.