David Wu

FILE – In this March 7, 2011 file photo, Rep David Wu, D-Ore., speaks at a luncheon in Hillsboro, Ore. Wu faced increased pressure Monday after House Democratic leader Nancy Pelosi called for an ethics investigation over an 18-year-old woman’s claim of an “unwanted sexual encounter” with him. Pelosi sent a letter Monday to leaders of the House Ethics Committee, saying an investigation is warranted. (AP Photo/Don Ryan, File)