Pat Buchanan says illegal immigration from poor and developing countries will overwhelm the United States and other Western countries in the next 50 years unless something is done. "We've already won the battle with the public," Mr. Buchanan tells The Washington Times. "The question is, when will the government respond?" In his book, however, Mr. Buchanan saves his strongest criticism for President Bush, writing: "Concerned about his legacy, George W. Bush may yet live to see his name entered into the history of his country as the president who lost the American Southwest that James K. Polk won for the...