It’s the dual citizenship that is the ultimate issue.
We have a president who was raised in a foreign country, swearing allegiance to Indonesia as a child.
As an adult, he called Kenya his home country. He refuse to wear an American flag on his lapel as a US senator.
This is not a natural born citizen.
Legally he is a natural born citizen. We are a country of laws and the law is pretty clear on the matter regardless of what birther web sites tell you.