Nearly a month after their initial social media bluster, Elon Musk reignited controversy by renewing his criticism of U.S. President Donald Trump's sweeping tax bill.

The billionaire SpaceX, Tesla and X owner who catapulted his zealous embrace of President Donald Trump into a powerful position slashing government spending now risks sweeping cuts to his own bottom line after resuming the feud that led to their very public bitter split last month.