General Motors CEO Mary Barra is voicing support for the Trump administration’s automotive tariffs, arguing they allow U.S. automakers to compete more fairly in the international market.“For decades now, it has not been a level playing field for U.S. automakers globally with either tariffs or non-tariff trade barriers,” Barra, chair and CEO of General Motors, said at The Wall Street Journal’s Future of Everything conference Wednesday. “I think tariffs are one tool that the administration can use to level th ...