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.

Losing Elon Musk’s backing could threaten Donald Trump’s growing influence among tech donors, social media audiences, and younger male voters. For Mr. Musk, the break could intensify scrutiny of his business practices and government contracts.

But Trump and Musk are kindred spirits in other ways. They're experts at generating attention who enjoy stirring the pot by riling up their opponents. Each has sought more power t