Elon Musk has long railed against the U.S. government, saying a crushing number of federal probes and safety programs have stymied Tesla, his electric car company, and its efforts to create fleets of robotaxis and other self-driving automobiles.

Elon Musk's net worth falls below $400 billion as Tesla stock plunges. Sales decline sharply in key markets, and investors remain uncertain, hoping for potential federal policy changes to aid Tesla's recovery.

Elon Musk’s net worth fell below $400 billion for the first time in two months, dragged down by a double-digit slide in Tesla Inc.’s share price. The automaker’s stock has fallen 27% after hitting an all-time high in mid-December on hopes that Musk’s proximity to President Donald Trump would boost the company’s fortunes.