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      GM back to the Senate

      A U.S. Senate subcommittee that's investigating the General Motors ignition switch recalls says it will hold a second hearing on July 17. The Commerce Committee's Consumer Protection and Product Safety Subcommittee likely will summon GM CEO Mary Barra for a return appearance. Former U.S. Attorney Anton Valukas, who investigated the problem for GM, also is a likely to appear. A subcommittee spokesman says the witness list hasn't been finalized. GM spokesman Greg Martin says Barra looks forward to updating the committee on changes that make the company more safety-centered. GM has recalled 2.6 million older small cars to fix faulty ignition switches. The problem is responsible for more than 13 deaths.