[Wyrd bið ful aræd]

Rubio was born in what, '71?

It appears his parents were not naturalized yet at that point.

[Kansas58]

so what?
It is nowhere required that Rubio’s parents had to be Citizens at the time of his birth.
Rubio is qualified, and no authority at all on the matter disagrees on this point.

[Gatún(CraigIsaMangoTreeLawyer)]

“It appears his parents were not naturalized yet at that point.”

I will certainly take your word for it.

The point is, his parents were not U.S. citizens at the time if of his birth.