ML/NJ
What is it about the future perfect (”shall have failed”) that you do not understand?
I said: “I believe it is up to those who doubt a candidate is a natural born citizen to prove he is not natural born. The Constitution does not require a candidate prove he is natural born.”
According to the Constitution (20th Amendment): “if the President elect shall have failed to qualify”
The President elect is the president elected by the electors, not a candidate. Therefore, if a President elect is not a natural born citizen (or at least 35 years of age, or resided in the US for 14 years) “then the Vice President elect shall act as President until a President shall have qualified.”