Elon Musk and Donald Trump's friendship unraveled publicly over a tax bill dispute.Musk criticized Trump's tax bill, calling it the 'Big Ugly Spending Bill.'Their relationship fractured with Musk opposing Trump's spending bill.Trump uncharacteristically stayed silent initially regarding Musk's criticism.The public disagreement unfolded with Musk digging up Trump's old posts to counter his views.Trump responded to Musk's attacks during a press appearance, addressing the EV mandate issue.Musk continued to tweet in real-time in response to Trump's remarks.Their feud escalated with Musk polling about creating a new political party and renaming Trump's bill.Musk dared Trump to cancel government contracts, leading to further exchanges.The dispute further intensified with Musk accusing Trump and making decisions regarding SpaceX.