Experts are still trying to assess the scope of Russia's cyber attack against the United States. But even without all the details in, former Homeland Security Secretary Jeh Johnson provides a sense of the damage: "If one assumes that this was espionage, then the Russians know a lot more about people like you and me or people in government or our capabilities or what we are talking about within government or within some of the more sophisticated elements of the private sector." Johnson's conversation with Ian Bremmer was part of the latest episode of GZERO World.