Donald Trump made a triumphant return to the White House on Wednesday, where outgoing president Joe Biden offered a show of civility to the bitter rival who denied him the same courtesy four years ago.

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Elon Musk, the wealthiest man in the world, has been a full-time presence at Trump’s Mar-a-Lago transition headquarters. According to media reports, he is advising the president-elect on cabinet nominees and even joined a conversation between Trump and Ukrainian President Volodymyr Zelensky last week.