Twitter says Musk's latest attempt to walk away from $44bn deal is 'invalid'       

Musk said Twitter should have notified him before it spent $7.75m in a separation agreement with Peiter Zatko, the company’s former security chief and whistleblower

It is Musk’s third attempt to withdraw his offer because of what he says are violations of the buyout agreement.

Twitter said Elon Musk’s latest move to cancel his agreement to buy the social network is invalid after the billionaire said the company’s treatment of a whistleblower gave him another reason to walk away from the $44bn (€43.5bn) deal.

Mr Musk’s latest move to terminate the deal is “invalid and wrongful” and “Twitter has breached none of its representations or obligations”, the company’s lawyers said in a letter.