The Obama administration will file suit to challenge Arizona's immigration law, an official told Fox News on Friday. The confirmation comes after Secretary of State Hillary Clinton said in an interview with a TV station in Ecuador earlier this month that the administration would challenge the law in court, though officials had long said the issue was under review. Administration officials initially would not confirm Clinton's statement. But an official told Fox News on Friday that while the review is still underway, the decision has already been made that a Department of Justice suit will be filed. The administration at...