PRESIDENT George Bush has proposed offering the estimated 13 million illegal immigrants in the US three-year guest-worker visas. Mr Bush said his plan did not amount to an amnesty for illegal migrants, almost 1 million of whom are estimated to enter the US from Mexico each year. In a speech in Tucson, Arizona, near the Mexican border, he said illegal immigration was "a serious challenge and our responsibility is clear — to protect the border. "The American people should not have to choose between a welcoming society and a lawful society," he said. "We can have both at the same...