The two most powerful people in the U.S. have gone from friends to foes.

Why it matters: Elon Musk and President Trump's (very) public online feud imperils billions of dollars in government contracts for Musk as the former DOGE head continues to go scorched earth against the president.

Driving the news: Musk has spent the past week criticizing Trump's "big, beautiful bill," escalating those attacks on Thursday via X, which he owns, calling for Trump's impeachment and accusing the president of being "in the Epstein files."

Here's a timeline of the key posts from the online implosion:

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