FILE - President Joe Biden participates in a tour of the General Motors Factory ZERO electric vehicle assembly plant with General Motors CEO Mary Barra, left, and United Auto Workers President Ray Curry on Wednesday, Nov. 17, 2021, in Detroit. Two of President Joe Biden's top goals, fighting climate change and expanding the middle class by supporting unions, are colliding in the key battleground state of Michigan as the United Auto Workers go on strike against the country's biggest car companies. (AP Photo/Evan Vucci, File) file photo
