The tech mogul, who campaigned for Trump, did not participate in substantive parts of the conversation, according to a source familiar with the matter.

Elon Musk joined Donald Trump's phone call with Ukrainian President Volodymyr Zelenskyy on Wednesday, multiple sources with direct knowledge of the call told ABC News.

President-elect Donald Trump put billionaire Elon Musk on the line with President Volodymyr Zelenskyy when the Ukrainian leader called to congratulate the incoming U.S. president