Wherever did you get that idea? It certainly is not present in US law or in the Constitution.
Where have you been for the last five months when these discussions have been raging on FreeRepublic and numerous other blogs?
If your parents are foreign nationals here legally when you’re born here, then you are a legal citizen. That is covered by the 14th Amendment.
The requirement to be President is that you be a “natural born” citizen. There are two criteria:
1. Your parents must be U.S. citizens;
2. You must be born within the United States or on U.S. territory.
The term natural-born citizen is to be found in Article II:
“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.”
On July 25th, 1787, John Jay wrote to George Washington, then Presiding Officer of the Constitutional Convention:
“Permit me to hint, whether it would be wise and seasonable to provide a strong check to the admission of Foreigners into the administration of our national Government; and to declare expressly that the Commander in Chief of the American Army shall not be given to nor devolve on, any but a natural born Citizen.”
John Jay was the First Chief Justice of the United States and it was this letter that caused Clause 5 of Article II to exist. In this letter we can see that the term natural-born citizen was present prior to the writing of the Constitution.
The reason for excluding the U.S. born children of foreign nationals is because of split allegiences and that nations, such as Great Britain, claim the children of its citizens as being born British.
Senator Obama’s father was a British citizen, and Barack Hussein Obama II was registered as a British citizen at birth by his father!