Rubio is not eligible for Article 2 Section 1 of the Conztitution.
The Supreme Court of the United States has never applied the term “natural born citizen” to any other category than “those born in the country of parents who are citizens thereof”.
Rubio's parents were not citizens when he was born. He is a statute citizen. A statute citizen (bestowed by mans pen) can never be made into a natural born citizen (bestowed by God/nature).
From Rep. John Bingham, father of the 14th Amendment:
"Every human being born within the jurisdiction of the United States of parents not owing allegiance to any foreign sovereignty is, in the language of your Constitution itself, a natural born citizen.” (Cong. Globe, 39th, 1st Sess., 1291 (1866))"
Again, Rubio's parents were not naturalized U.S. citizens when he was born and had not taken the oath of allegiance.