“What is the supposed issue with Don Jr running for President?”
Ivana wasn’t a U.S. Citizen when he, Ivanka, and Eric were born. (It was OK for Hussein Obama, but wouldn’t be for a conservative, y’know.)
That didn't matter in 1787. Only the father's citizenship status mattered. The law used in 1787 automatically gave the woman her husband's citizenship upon marriage.
Women didn't acquire the ability to pass on citizenship until the Cable act of 1922. (except in the case of out of wedlock births. Children with no known father were assigned the citizenship of the mother.)
I even seem to remember that congress passed a law in the 1870s or so strictly forbidding women from passing on citizenship. I used to keep references around a decade ago, but now I have to rely on my increasingly unreliable memory.