“I don’t think that he was born in the US.”
Then you are a fool.
There is a birth certificate in the Hawaii vital records department. The Jewish Republican former Governor vouched for it when she was Governor. The non-Jewish Democratic former Governor also vouched for it when he was Governor and furthermore when he was a student at the University of Hawaii he personally knew both of Obama’s parents. Furthermore there were birth notices in two Honolulu newspapers shortly after the birth. And his father’s immigration records state that Barack Obama II was born in Honolulu on August 4, 1961.
My own birth in Pennsylvania is nowhere nearly as well documented.