Signed the Constitution, but by the definition of natural born citizen he couldn't become president? Don't believe it.
The right of becoming a citizen was one of the biggest grievances of the Declaration of Independence.
These men were not born in the colonies and all signed the Declaration of Independence.
Gwinnett, Button born Down Hatherley, England
Morris, Robert born Liverpool, England
Smith, James born Northern Ireland
Taylor, George born Ireland
Thornton, Matthew born New Hampshire Ireland
Wilson, James born Carskerdo, Scotland
Witherspoon, John born Gifford, Scotland