Billionaire Elon Musk joined President-elect Trump's call earlier this week with Ukrainian President Volodymyr Zelensky, a sign of how Musk's close relationship with Trump could manifest itself as he prepares to take the White House.

A source confirmed to The Hill's partner network NewsNation that Musk was on the call Trump had with Zelensky on Wednesday. Trump has spoken with a number of world........

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