Below is a list of U.S. regulators who oversee Musk's companies, including automaker Tesla, rocket and satellite company SpaceX, brain implant company Neuralink, social media platform X and construction firm The Boring Company. The Federal Communications Commission in April voted to open a review of the decades-old spectrum sharing regime between satellite systems sought by SpaceX.

The broken alliance between the President and world's richest man could threaten Musk's lucrative pending -- and future -- federal subsidies.

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