Why we should have another referendum about Donald Trump's citizenship!

It's been a while since I have posted here, but the story about Donald Trump's mother's birth certificate, and the press conference of Donald Trump really got into my mind, because he was born in a hospital in Queens in New York, and his mother has been born in Lewis on the island of Isle of Lewis, in the Outer Hebrides, of Scotland. And his father was born in the Bronx, New York. So, the question is: <br><br>Why is Donald Trump still an American citizen? I don't think he is American, because his father was born in the USA and his mother is Scottish, so we should figure out if he is American or not, because that's important for his job as president of the USA.