Musk attacked Trump directly over his signature spending bill for the first time Thursday, sparking an explosive back-and-forth.

It began with Musk complaining about the centerpiece of Trump’s legislative agenda, which the president at first took in stride. Eventually Trump let slip that he was disappointed in his former adviser, prompting Musk to unleash a flood of insults and taunts.

The exchange broke open a feud that had been simmering for weeks out of public view. 'Trump is in the Epstein files,' Musk wrote on X.