Weicker’s parents = both Americans.
Romney’s parents = both Americans.
Goldwater’s parents = both Americans.
Arthur’s parents = both Americans (although Arthur’s father was born in Ireland and there is a dispute as to whether he actually was a naturalized American at the time of Chester’s birth).
Obama’s parents = one American and one British subject. Later one Indonesian adoptive father.
What about Woodrow Wilson’s England-born mother?
Was he not a natural-born citizen?