WASHINGTON — President Donald Trump’s friendship and political alliance with Elon Musk, the world’s richest man, who fueled Trump’s campaign with record amounts of cash before working at the White House by his side until last week, appears to be over, with both men leveling searing criticism against one another in a sharp public row.

Musk had been criticizing the Trump administration over its signature legislation, the “One Big Beautiful Bill Act,” for its projected impact on the national debt throughout last week. But his calls to “ kill the bill ” on Wednesday prompted Trump, speaking to media from the Oval Office, to respond in kind.

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