Twitter has taken billionaire Elon Musk to court to try to force him to buy the social media firm, setting up a legal battle with the world's richest man.
It comes after Mr Musk announced he was walking away from his proposed $44bn acquisition of Twitter on Friday.
He claimed Twitter had not given information about the number of fake and spam accounts on the platform.
Now Twitter has asked a Delaware court to order Mr Musk to complete the merger at the agreed $54.20 per Twitter share.
"Having mounted a public spectacle to put Twitter in play, and having proposed and then signed a seller-friendly merger agreement, [Mr] Musk apparently believes that he - unlike every other party subject to Delaware contract law - is free to change his mind, trash the company, disrupt its operations, destroy stockholder value, and walk away," said the lawsuit.