The legislation for Trump's agenda on taxes, health care, immigration, energy and more would add $3.3 trillion to the deficit over a decade, according to the Congressional Budget Office.

"If this insane spending bill passes, the America Party will be formed the next day," Musk wrote in an X post on Monday.

A marathon vote series in the Senate continued overnight and into the morning Tuesday on President Trump's massive tax bill as Republicans worked to pass the centerpiece legislation of Mr. Trump's second-term agenda.