Dorsey, who stood down as Twitter's chief executive in November and left the board in May, was asked for documents and communications about Musk's April agreement to purchase the social media platform and about its spam accounts.
In July, Musk told Twitter he was severing his agreement to buy Twitter for $54.20 per share because he claimed Twitter had violated the deal contract, alleging the company defrauded him by concealing the number of fake accounts in its regulatory filings.
Twitter has denied Musk's spam allegations.
Since, Musk and Twitter have sued one another. Twitter asked a judge on the Delaware Court of Chancery to order Musk to close the deal. A five-day trial is set to commence on October 17.
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