It was cemented into law in article II where it uses two different terms, thereby implying they cannot mean the same thing.
"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."
Yep, and it was solidified by Monor, which in turn has been solidified dozens and dozens of times in SCOTUS cases which cite to it because it is the LAW.
Obama is an Illegal POTUS.
EVERYTHING he does in the office is ILLEGAL. It’s abhorrent he is still in the People’s house.