Federal law, as in passed by congress
? And for two centuries? — then that means that the power must be the Art 1 Sec 8, and that means that the power is over naturalization. (14th Amd wasn't until after 1850; two hundred years after that is 2050.)
So then he is claiming to be a natural born citizen under naturalization laws; that's ridiculous.
He’s the Constitutional expert, not you.