I don’t doubt the good senator made such a stupid statement. That is, jurisdiction means not owing allegiance to another country. What poppycock. They should have put that in the damn amendment instead of jurisdiction.
Google book search "The Heritage Guide to the Constitution," a book you can find online which is written by Edwin Meese III of the Heritage Foundation. Pay attention to pages 384 and 385, especially the last paragraph on page 384 continuing on to 385. Both pages contain plenty of information.
This is not new information, but it is the truth. There are some who refuse to believe it for their own reasons. But history is history and truth is truth whether you agree with it or not. Just as with other Constitutional amendments, some people have an interest in twisting the meaning and purpose of this amendment. But the originators left plenty of clear information as to what they did, why they did it and what they meant by doing it that way.
One hundred and forty years later some people may have their own idea as to what jurisdiction means so they think they can apply that definition to the phrase "subject to the jurisdiction." They are mistaken. Anyone with eyes can read the truth for themselves. It is unfortunate that so many have decided to take their own misguided word for it means.