A mediator for General Motors has begun negotiations about settling more than 300 claims related to a deadly ignition switch problem in some older model small cars. Kenneth Feinberg confirmed in an interview with The Associated Press that he met for four hours Friday with Robert Hilliard, a Corpus Christi, Texas, lawyer who said he represents families of 53 people killed and 273 injured in crashes of defective GM vehicles. Feinberg would not comment specifically on what was discussed.