After dropping more than $250 million on his effort to elect Donald Trump, billionaire and Pentagon contractor Elon Musk could now use his power and influence to steer sweetheart deals to his network of companies, Sen. Elizabeth Warren, D-Mass., warned in a letter sent Monday to the Trump transition team.

Musk, the CEO of X and Tesla who is now worth more than $400 billion, has been named by President-elect Trump as........

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