There is no law and you know it.
8 U.S. Code § 1401 - Nationals and citizens of United States at birth:
"The following shall be nationals and citizens of the United States at birth:
(a)a person born in the United States, and subject to the jurisdiction thereof;"
It could be fixed by inserting the words "Of parents legally in the United States" right after the word "born". Easy, peasy.