Auto workers strike would test Biden's assertion he's the 'most pro-union president in US history'

FILE - President Joe Biden listens during a tour at the Detroit Auto Show, Sept. 14, 2022, in Detroit. From left, Sen. Debbie Stabenow, D-Mich., Mary Barra, CEO of General Motors, Biden, Rep. Debbie Dingell, D-Mich., Ray Curry, President of the United Auto Workers, and Michigan Gov. Gretchen Whitmer. The prospect of an auto workers strike could test Joe Biden's treasured assertion that he's the most pro-union president in U.S. history. A work stoppage against the Big Three U.S. automakers has the potential to reshape the political landscape in the battleground states of Michigan. (AP Photo/Evan Vucci, File)