Billionaire Elon Musk joined Donald Trump in the president-elect’s phone conversation with Ukrainian President Volodymyr Zelensky this week, a new report says.

The billionaire, who is slated to take on a key domestic role in Trump's administration, is already dipping his toes into foreign policy

Since the election, Mr. Musk has used his social media company to talk up how bright the future will be under the president-elect.