The prospect of an auto workers strike could test Joe Biden’s treasured assertion 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 state of Michigan. It could unleash economic shockwaves that might eventually reverberate nationwide. The Democratic president says he hopes negotiations can lead to a win-win for both sides. The United Auto Workers union says a strike will occur if tentative contract agreements aren't reached by just before midnight Thursday. Donald Trump has seized the opening to urge rank-and-file members to break with their union and back his 2024 Republican presidential bid.