Lack of birth certificate.
He was raised for quite a while in Indonesia.
He may be African and he may be American, but he is not African-American in the sense that your average born and raised in the US black is.
He’s merely a figurehead so that people can feel good about having elected the first African-American president.
Ben Carson is a better example.
Ah, I didn’t realize there were so many caveats to being “American”. I’d better check my genealogy and make sure no close relative ever lived abroad for a period, had “Communist sympathies” or was born somewhere like Kansas but not really “from” Kansas (whatever that means).
I’ll submit the info here and maybe you can all form a 3 member jury and let me know if my family is sufficiently “American” for you.