The rift between Donald Trump and Elon Musk widened on Thursday, with two of the world’s most influential figures trading insults over the Republican tax policy bill at the center of the president’s agenda. Trump told reporters that he was “disappointed” by the Tesla Inc. chief executive officer, saying the bill’s cuts to electric-vehicle tax credits drove his billionaire former adviser’s opposition. In a remarkable scene, Musk responded in real-time, posting rebuttals on social media as the president spoke.

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