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Barra is defending GM to Senate subcommittee on consumer protection.
Lawmakers point out General Motors has yet to fire anyone over ignition switch problem.
Senator Kelly Ayotte launches 'criminal' charge.
A defective ignition switch linked to 31 accidents and 12 deaths in its 2005-2007 Chevrolet Cobalt and 2003-2007 Saturn Ion models.
The problem was detected as early as 2001, but GM waited until last month to issue its recall.