 The issue of illegal immigration has long been controversial in the United States.In 2007, President George W. Bush called for Congress to endorse his guest worker proposal, stating that illegal immigrants took jobs that Americans would not take.The Pew Hispanic Center notes that while the number of legal immigrants arriving has not varied substantially since the 1980s, the number of illegal immigrants has increased dramatically and, since the mid-1990s, has surpassed the number of legal immigrants.