Cruz, Haley and Rubio are not natural born citizens, they all had foreign parent(s) and were born with foreign nationalities.
Natural born citizens are NATURALLY citizens because they have only ONE nationality.
It was that singularity of nationality that the founders were requiring.
Sole allegiance to the USA.
They're all awful too. Honestly I would focus on the awfulness of them.
You can be "natural born" and still swear allegiance to Davos in your heart.