The vow by the United Auto Workers that they’re going to press federal labor charges against President Trump and Elon Musk certainly puts the hay down where us mules can get to it. The union is upset that Trump and Mr. Musk seemed, in their remarks on X.com on Monday evening, to favor firing striking workers at a hypothetical company. “When we say Donald Trump is a scab, this is what we mean,” says the UAW’s president, Shawn Fein.