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Elon Musk’s clash with President Donald Trump appears to have backfired on him. The 53-year-old, who accused the president of being ungrateful, lost $15 billion on Thursday, and his company Tesla’s shares tumbled as much as 9% during trading hours. According to Forbes’ real-time billionaires list, Musk is worth $399.5 billion, down 3.63%. Watch the implications of clash over Trump spending bill.