The Senate Judiciary Committee, which is to begin Kagan's confirmation hearings June 28, has requested all documents from her tenure in the Clinton White House. The panel also requested papers related to Kagan's failed nomination to a federal appeals court, which are expected to be included in Friday's release.

A first, 46,500-page batch of files from Kagan's stint as a domestic policy adviser to Clinton, released last week, yielded some clues about her pragmatic style and views. She helped Clinton craft a middle-ground position on late-term abortions that angered groups on both sides of the highly charged issue, praised a legal brief designed to protect affirmative action and helped craft an aggressive strategy to enact gun control measures. She also was instrumental in intense but ultimately unsuccessful bipartisan negotiations on a major anti-smoking initiative.