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CBS News 60 Minutes explores "how the politics of immigration policy made it remarkably easy for members of terror cells to enter the United States on temporary visas as tourists or students and simply disappear into American society." The report reveals that nearly half of the seven million illegal immigrants in the United States entered the country on temporary visas and never left. Although in 1996 the Congress passed a bill that mandated that the INS set up a computerized entry-exit system to track aliens entering and leaving the country, its implementation failed as a result of "business concerns" voiced by border cities' chambers of commerce.