And if he does have one?
Legally Zero cannot take the office of the Presidency unless he PROVES that he has the basic qualification, citizenship from being natural born.
Says who? How did any of our prior presidents prove they had the basic qualifications? What's the procedure?
If he has one he will produce it and stop the nonsense.
Past presidents had two American parents traceable and verifiable along with his time and place of birth. This has never been an issue which does not mean, as you apparently believe, that it cannot be one.
Lincoln has about the most tenuous past of any president I am aware of yet his descent is verifiable.
And the procedure is simple. Provide a valid birth certificate to the Electoral College.