“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… ” So reads a key clause in the 14th Amendment to the US Constitution. Republican presidential nominee contender Donald Trump has reignited a heated and emotional debate over so-called “birthright citizenship,” unleashing a new look at America’s immigration policy. The issue taps into what some say is the heart of what it means to be an American.