14th amendment does not address natural born citizen requirement. It does speak to naturalized citizens - which is a different concept.Quote from KavonTrebor:
NOt case law but the 14th Amendment:
All persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States and of the State wherein they reside."
A case to look at:
http://en.wikipedia.org/wiki/United_States_v._Wong_Kim_Ark
enjoy
Natural born citizen is quite likely a much tougher requirement to meet than citizen.