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

An intense public feud erupted on Thursday between President Donald Trump and his one-time ally, billionaire Elon Musk, with an argument about Trump’s massive tax and domestic policy bill raging across social media and in the Oval Office.

Private tensions between the world’s most powerful man and the world’s richest spilled out into a public war on Thursday, ending the alliance between President Donald Trump and Elon Musk in the most dramatic way possible.