For all the insults that Mr. Musk and Mr. Trump traded on Thursday, don’t be surprised if they make up again days from now. In the meantime, they both benefit.

Trump warns his former ally against backing any Democratic candidates to challenge the Republicans, as a messy feud between the two escalates.

Donald Trump's former allies say the political battlefield is littered with the scorched remains of those who have had a falling-out with him.