The Constitution does require the president to be a natural born citizen, however it doesn’t not suggest nor require any action on the part of the candidate to prove his or her status.
***Sure it does. It requires him to qualify, and that means to show evidence. The burden of proof is on the candidate, not on the people. That’s like saying about the 3rd amendment when there’s an army general taking over your home, “Well, the constitution requires that I don’t do this, but it doesn’t specify exactly what I cannot do so the burden of proof is on you, the homeowner, to prove that what I’m doing is wrong.”
No, its not like that at all.