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Twitter Inc (TWTR.N) sued Elon Musk on Tuesday for violating his $44 billion deal to buy the social media platform and asked a Delaware court to order the world's richest person to complete the merger at the agreed $54.20 per Twitter share.

"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 complaint.

The lawsuit sets in motion what promises to be one of the biggest legal showdowns in Wall Street history, involving one of the business world's most colorful entrepreneurs in a case that will turn on staid contract language.

On Friday, Musk said he was terminating the deal because Twitter violated the agreement by failing to respond to requests for information regarding fake or spam accounts on the platform, which is fundamental to its business performance