The Constitution says the president must be a "native-born citizen."
It does not say the president cannot also be a citizen of another country.
For example, let's say the child of a Japanese husband and British wife was born in Cleveland.
I believe that under the laws in these countries he would be from birth a citizen of both UK and Japan. Despite this, under our laws he would be a "native-born citizen" and eligible to be president when he reaches the age of 35.
I agree. If one looks at his selective service registration they will see a familiar pattern of odd circumstances and/or form numbers/dates to say the least.