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This book will make a major contribution to a most important national debate , " Dr Harris says . His research project will examine the political parity that defines the current national debate , whether it is an aid or a menace to our traditional notions of democracy , and what changes can be made . While immigration 's impact on the United States continues to be a subject of intense national debate , there can be no doubt that the large number of immigrants now living here represents an enormous challenge . Why is the United States flirting with a new doctrine of preemptive war so radical it has no precedent in international law or American history - - and why has n't this flirtation provoked our politicians to conduct a serious national debate , first of all in Congress ? Whatever craven thirsts might have inspired its advocates , the right of physicians to prescribe " medical beer " was the subject of intense national debate , drawing the attention of officials at the highest levels of government and provoking arguments within the American Medical Association and other professional groups . Samuel 's research project will examine the political parity that defines the current national debate , whether it is an aid or a menace to our traditional notions of democracy , and what changes can be made . " While immigration 's impact continues to be the subject of intense national debate , there can be no doubt that the large number of immigrants now living in the United States represents an enormous challenge , '' said Steven Camarota , director of research at the Center for Immigration Studies .