President Trump’s decision to pull a close associate of Elon Musk’s out of the running to lead NASA helped doom an extraordinary partnership.

Less than a week later, their potent political alliance met a dramatic end Thursday when the men attacked each other with blistering epithets. Trump threatened to go after Musk’s business interests. Musk called for Trump’s impeachment. Here’s a look at the implosion of their relationship in their own words.

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