'Snowden Reporter' Says More To Report On NSA

Glenn Greenwald, the reporter for "The Guardian" who reported on the leak of top-secret documents by U.S. government contractor Edward Snowden, says that there is much more to learn about the NSA's secret surveillance programs. Speaking to Reuters in Rio de Janeiro, Brazil, Greenwald said he is doing everything he can to expose what he called U.S. government "excesses" and "extreme secrecy." (Reuters video)