Musk used X—formerly Twitter—to help rebuild Trump's public image and support his presidential run. What happens if he turns it against the president?

Donald Trump and Elon Musk exchanged back-and-forth insults online after a disagreement over the president's spending bill. Here's a complete timeline of Donald Trump and Elon Musk's friendship, including why they are now feuding.

The unlikely alliance unraveled in real time, with Trump telling reporters in the Oval Office he was “very disappointed” in the tech mogul’s criticism of his spending bill, and Musk railing against the president on X.