I think it means that the writers of the Constitution used vague language in writing the rules for who could become President by using a term that did not get defined in the document. Their main goal was to make sure the President would not be loyal to another country by birth, but they wanted to leave it somewhat open because they knew situations would eventually change.
Either that, or they wrote it in so that 224 years later about 50 people would still have something to argue about that was of no consequence and with which they could impugn the reputations of the “non pure.”
As for Rubio, I would say “probably?”
>> “I think it means that the writers of the Constitution used vague language in writing the rules for who could become President by using a term that did not get defined in the document.” <<
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A truly absurd statement for a number of reasons.
First, none of the terms used in the constitution are defined in its text, because they were terms of common usage. That is especially true for Natural Born, since the Supreme court had little difficulty coming up with the correct definition four times in succession.
Second, it is rare for a legal document to include definitions of terms unless those terms are newly created for the purpose of the document.