Musk has been pushing for ways to pay for the massive deal, for which he took on billions of dollars in debt and earlier sold $15.5 billion worth of shares in Tesla.
The billionaire initially tried to step back from the deal after his unsolicited offer was accepted in April. Jack Dorsey, who co-founded Twitter in 2006 and stepped down as CEO last year, tweeted to apologize for growing the site too quickly, following news of the firings.Musk has been searching for ways for the social media platform to make money after the buyout, including an idea to charge users $8 a month for verified accounts.