The National Archives has announced that about 46,500 pages of documents from Supreme Court nominee Elena Kagan’s four years of service in the Clinton White House will go online at 1 p.m. E.T. Friday, providing a fresh trove of information for Kagan’s supporters and opponents to pore through in search of ammunition for her confirmation hearings set to start later this month. White House counsel Bob Bauer indicated in a letter last month that Kagan’s work as a lawyer and policy adviser for President Bill Clinton generated about 160,000 pages of material, including 80,000 pages of paper documents and 79,000...