His answer was of course, everyone in this country is under US jurisdiction. It was like he caught himself...shouted the caller down and hung up.
There's 'territorial jurisdiction' that is to follow laws of the country, and then there is citizenship jurisdiction of aliens and US citizens alike. Mexican citizens who have babies inside the United States are still Mexican nationals as they have jus sanguinis citizenship of their home country. The 14th Amendment's 'subject to the jurisdiction thereof' is speaking completely about citizenship.
Could be. I think the court process could be long and lengthy.
I have friends, legal ones, that got their US citizenship. They are still citizens of Mexico. They hold dual citizenship and can travel overseas with a US or Mexican passport.