By TOM KRISHER AP Auto Writer DETROIT (AP) — General Motors says it will no longer support the Trump administration in legal efforts to end California's right to set its own clean-air standards. CEO Mary Barra said in a letter Monday to environmental groups that GM will pull out of the lawsuit, and it urges other automakers to do so. She said the company agrees with President-elect Joe Biden's plan to expand electric vehicle use. Last week, GM said it is testing a new battery chemistry that will bring electric-vehicle costs down to those of gas-powered vehicles within five years. […]

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