Nothing in the Constitution says they have to be. anyone born on U.S. soil and subject to its jurisdiction is a natural born citizen, regardless of parental citizenship.
If it was a legitimate argument it would have been brought up when she tossed her hat in the ring to run for president.....
Not only are you incorrect...but an insane idiot who is ignorant of basics in the Constitution.
That feisty little detail about "subject to the jurisdiction thereof" is simply tested. A US citizen can be compelled to sit on a jury. A non-citizen can not be compelled or allowed to sit on a jury. Neither parent could could convey citizenship to their offspring. It is only an interpretation by SCOTUS of the 14th Amendment that has permitted birthright citizenship that was originally intended to apply to recently freed slaves. There are no persons living today that meet that special qualification.