Mary Nichols in Fortune: Trump’s Emissions Fight With California Pits GM Against Ford

General Motors Co., Toyota Motor Corp. and Fiat Chrysler Automobiles NV plan to back President Donald Trump in a contentious battle with California officials over automobile emissions rules, splitting with major rivals including Ford Motor Co.

Mary Nichols, chairman of the California Air Resources Board, said in a statement that the state regulator was disappointed in automakers “hiding behind the Trump administration’s skirts and its assault on public health.”

“California will continue to carry out our mandate to meet national air quality standards and keep working with those automakers committed to a framework that delivers cleaner vehicles that benefit consumers and the environment,” Nichols added.