Please open, and read the Wikipedia article, attached in the link below,
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&ved=0ahUKEwjg
speqgJjWAhUrjFQKHfRfBk8QFggwMAI&url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FNatural-born-citizen_clause&usg=AFQjCNGziCNg-RjHgw46jEG7rsBGvU6NVg
