The 14thA doesn't say that, nor do I.
OK, in that case could you please rephrase this statement? I'm not getting your point.
IMO, the dissimilar language used in the two references to jurisdiction makes it clear there is no ambiguity in the use of the first ("subject to"), that the reference addresses citizens.
Thus, the second reference ("any person...within") clearly provides that any entrant shall be denied Constitutional protections of due process, equal protection of the law, etc
My immediately following post provided "shall not be denied". No rephrasing necessary. Recommend you also see Mr. K's relevant and succinct post.
Have a nice day.