Offers an unexpected apology that sets off a series of thumbs up for him on social media.
Musk also fired CFO Ned Segal, and head of legal and policy Vijaya Gadde.
Musk is set to close the $44 billion deal on 28 October.
Musk had called off the merger accusing Twitter of not heeding request for info on bot accounts.
Musk will have to pay $1 billion if he fails to make the complete transaction for the deal.
