The escalating war of words this week between President Donald Trump and tech mogul Elon Musk marked the most contentious chapter in a yearslong and at-times rocky relationship between two of the most influential figures in business and politics. Musk, a former Democrat, has criticized Trump in the past, but over the past year forged a strong relationship with the president that positioned him to wield significant power in the early months of Trump's second administration.

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