A bill that would protect attorney-client privilege during federal investigations of corporations gained another major supporter Tuesday when Sen. Jim Webb, D-Va., added his name to the sponsors list.

The bill, which passed the House of Representatives on voice vote, now has the backing of a dozen high-profile senators, 32 former federal prosecutors and a diverse coalition of organizations that includes the American Civil Liberties Union and the Chamber of Commerce, says Susan Hackett, senior vice president and general counsel for the Association of Corporate Counsel.