Since the September 11 attacks, a new consensus appears to have developed on the need for tighter immigration enforcement and border controls. Gone are the days when the Wall Street Journal repeatedly called for a constitutional amendment declaring that “there shall be open borders.” Knowledgeable Americans have come to understand that our welcoming immigration policies are easily exploited by terrorists and that porous borders and lax immigration enforcement are no longer an option. With at least 8 million illegal aliens living in the United States and nearly one million new aliens arriving each year, the potential for terrorists entering the...