By the way, if you actually listen to Justice Scalia in that exchange you will see that it is not just a question with no meaning in his mind.
And yet in upholding the law of citizenship as set forth by the immigration act a concurring opinion by Associate Justices Antonin Scalia and Clarence Thomas proposed that the Supreme Court simply did not have the power of "conferral of citizenship on a basis other than that prescribed by Congress".
This case was about something beside NBC. This was a child born out of wedlock to a foreign woman and a US man in a foreign country. According to the law the child didn't meet the citizen at birth requirement.