Natural Born refers to being born on US soil of two citizen parents. Rubio is a citizen but not “natural born”. Obama MAY fit this category, Cruz wasn’t even born here.
The founders wanted to avoid excatly what we got in Obama - a leader who only pretends to be loyal. Obamatrade is positioned to destroy our sovereignty. This is what we get for figuring it’s ok to let the first black POTUS evade the Constitution.
There is nothing in US law to support this assertion. That is why lawsuits alleging this always get tossed. There are only two types of US citizens, natural born and naturalized. This assertion that there are additional types, like "Citizen at Birth" has no support.