Although a very old SCOTUS case, Wong Kim Ark does a good job of going over the possible interpretations of the Constitution.
Wong Kim Ark was the child of “permanent residents” (as it was defined then), and the court ruled he was indeed a citizen. I could see a law or executive order that excludes children of undocumented parents from citizenship as being a legitimate argument.
The dissent in this case also provides some clues as to how to construct a law or policy on this topic.
I’m not advocating one way or the other, but there are colorable legal arguments that can be made in support of Trump’s position on this
Link: https://supreme.justia.com/cases/federal/us/169/649/#tab-opinion-1918089
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