The United Auto Workers has filed federal labor charges against former President Trump and billionaire Tesla CEO Elon Musk after the pair advocated for the illegal firing of striking workers. On Monday, Musk was heard laughing in agreement as Trump made these remarks during an audio live stream on Musk’s social media site X, formerly known as Twitter.

Donald Trump: “Well, you, you’re the greatest cutter. I mean, I look at what you do. You walk in, and you just say, 'You want to quit?'”

Elon Musk: “Yeah.”

Donald Trump: “They go on strike. I won’t mention the name of the company, but they go on strike. And you say, ’That’s OK. You’re all gone.’”

The UAW reiterated in a statement that, under federal law, workers cannot be fired for going on strike, and threatening to do so is illegal under the National Labor Relations Act.

Meanwhile, the campaign reform group End Citizens United has filed a separate complaint with the Federal Election Commission arguing Musk’s softball interview of Trump amounted to an unlawful corporate contribution to Trump’s presidential campaign. We’ll have more on Elon Musk’s embrace of Donald Trump after headlines.