Buchanan senior had become a naturalized citizen by the time of James’ birth, hadn’t he? If not, Buchanan was covered under the exception clause the founders placed int he Constitution.
This entirely foolish argument turns on what BRITISH law specified at the time of his birth - the British law which made Buchanan Sr. a crown subject was still in effect in 1812, as it was a major cause of the war.
So, therefore, IF having a father born overseas and a crown subject by British law is disqualifying, then James Buchanan Jr. was never President.
The whole thing is idiotic.
If he was born in Hawaii, he's OK. If he wasn't, he's out.
The rest of it is a waste of time.