The United Auto Workers union said Tuesday that it filed federal labor charges against former President Trump and Tesla CEO Elon Musk after the duo's conversation on X veered into talk about workers striking. Why it matters: The UAW recently endorsed Vice President Kamala Harris' 2024 bid, while the union is also aiming to organize Tesla workers. Driving the news: The UAW said it filed the charges against Trump and Musk "for their illegal attempts to threaten and intimidate workers who stand up for themselves by engaging in protected concerted activity, such as strikes."