[Badabing Badablonde]

US Constitution, Article II, Section 1 No person except a natural born citizen, or a citizen of the United States , at the time of the adoption of this Constitution, shall be eligible to the office of President; neither shall any person be eligible to that office who shall not have attained to the age of thirty five years, and been fourteen Years a resident within the United States.

[PghBaldy]

citizen of the United States , at the time of the adoption of this Constitution ... THAT is to granfather in the founders. They were all British subjects at birth.