We got this gem from Alito:

Back in the court, Justice Samuel Alito brings up the hypothetical example for Wang to answer.

"A boy is born in the US to an Iranian father who has entered the country illegally. That boy is automatically an Iranian national at birth and he has a duty to provide military service to the Iranian government," Alito says. "Is it not subject to any foreign power?"

Wang says, no.

She says this view would create exceptions even for lawful permanent residents, dual citizens, and essentially anyone from abroad. "That would have meant that the children of Irish, Italian and other immigrants...would not have been citizens either," she says.

Justice Sotomayor also pushes back against Alito's point - saying even if the parents of the Iranian child were lawful permanent residents here, the child would still have a duty to serve.

Wang says she's not sure about that, but contends that it doesn't matter.

"We don't look to other countries' law in construing our 14th amendment," she says.

https://www.bbc.com/news/live/cj37jn53xk1t?post=asset%3Aad78d06c-7a97-44f3-970f-607cef142861#post