Tesla remains Musk’s best-known business, but its fortunes are less directly tied to the government than SpaceX, his rocket-building company.

Elon Musk, the world's richest man, threatened to fund primary challenges against supporters of President Trump's sprawling tax and spendng bill 'if it is the last thing I do on this Earth.'

U.S. Senate Republicans passed President Donald Trump's massive tax-and-spending bill on Tuesday by the narrowest of margins, advancing a package that would slash taxes, reduce social safety net programs and boost military and immigration enforcement spending while adding $3.3 trillion to the national debt.

Live updates and the latest news as the Senate votes on the Republican agenda bill and Trump tours the Florida migrant center dubbed "Alligator Alcatraz."

The Republican-controlled U.S. Senate voted on Tuesday to pass a wide-ranging tax-cut and spending bill sought by President Donald Trump, which would cut Medicaid healthcare and food assistance programs for the poor and disabled.