Tesla Inc. CEO Elon Musk subpoenaed former Twitter Inc. CEO Jack Dorsey as he fights a lawsuit by the social media firm searching for to make him full the $44 billion buyout he proposed.

Dorsey, a co-founder of Twitter, has been a backer of the Musk bid, tweeting in April that Musk was the “singular answer I belief” to take over the corporate. He stepped down as Twitter CEO final yr.

The discover of subpoena, filed Monday, got here amid a flurry of filings that additionally included discover of subpoenas served by Musk on Friday on Kayvon Beykpour, former head of client product at Twitter, and Bruce Falck, previously accountable for income product.

Dozens of individuals, banks and funds have been subpoenaed within the authorized battle enjoying out in Delaware over the deal. The push to assemble info and interview vital figures within the deal comes forward of an expedited schedule for the trial, slated to start Oct. 17 and final 5 days.

Musk says Twitter wasn’t trustworthy with him about how a lot of its buyer base is made up of spam and robotic accounts. Earlier this month, he accused the corporate of hiding the names of staff particularly answerable for evaluating that proportion. Twitter says his complaints are a pretext for him to stroll away.

Beykpour was the highest product govt at Twitter for years earlier than he was unexpectedly dismissed by new CEO Parag Agrawal. It was his product crew that was most instantly answerable for increasing Twitter’s person base — and it’s the high quality of that base Musk has questioned in searching for to flee from the acquisition.

Falck is a former Google advert govt. Earlier than being employed by Twitter in 2017, he was CEO of advert tech participant Flip. Previous to that, he was COO of BrightRoll, an promoting platform acquired by Yahoo.

Each Twitter and Musk have sought info from a raft of individuals and funding corporations that dedicated fairness to Musk’s buy in addition to the banks that suggested Musk and pledged billions in financing.