
Cracks in the relationship between President Donald Trump and Tesla CEO Elon Musk, his self-proclaimed 'First Buddy', are scaring Tesla shareholders as the two fired salvos at each other in increasingly heated rhetoric on Thursday. Shares fell more than 8% on Thursday on a day otherwise devoid of news for the electric automaker, as traders dumped the stock in heavy trading after Musk stepped up his criticism of the president's tax bill.