My copies of the Constitution are explicit as to eligibility for POTUSA in Article 2 Section 5 as ‘No person except a natural born citizen or a citizen of the United States, at the time of the adoption of this Constitution, shall be eligible to the office of President;......’. Notice the word ‘or’ which was applicable only to persons at the time of adoption of the Constitution. It is clear to me by this wording that the Founders were very discriminating between a ‘natural born citizen’ and an ordinary ‘citizen’. To further separate their two categories the Founders only required Congress persons to be simply ‘citizens’. No person or court can change the words in my copies of the Constitution.
And under the Constitution there were three types of US citizen, those at the time of the adoption, those who were natural born, and those who are naturalized. Of the three only naturalized citizens are ineligible. There is no other category of US citizen. Currently one is either born a citizen or one must be naturalized as a citizen.