The Twitter has issued a series of subpoenas for some of Silicon Valley's most prominent names in its legal battle against Elon Musk. According to sources, Twitter sent legal requests recently to billionaire investors Chamath Palihapitiya (and Marc Andreessen). TheTwitter also subpoenaed one the entrepreneurs, who helped Musk found PayPal, David Sacks and SpaceX, along with investors Joe Lonsdale, Keith Rabois and Jason Calacanis. These legal requests could force the men to testify before the courtroom when the five-day trial begins in October.

Lonsdale called the legal requests of social media company a "giant harassing fish expedition," via Twitter. The social media company requests information from Musk's circle regarding any communication between him and his circle about bots or spam. The legal request includes information about Musk's attendance at the All-In Summit in Mai -- which he attended along with Palihapitiya and Sacks. Musk appeared to reverse his plans to purchase Twitter at the Miami event. This was weeks before he tried to cancel the $44 billion deal in July.

Notably, not all of the people who received legal requests from Twitter were involved in Musk's purchase. The billionaire was publicly supported in his financing efforts. After Twitter had sent subpoenas for several banks involved in financing the deal, including  Morgan Stanley and Citigroup, Musk received the missives.

Delaware is currently attempting to bring the case to trial. Twitter won its first battle against Musk last month when Chancery Court judge Kathaleen J. McCormick granted an expedited trial. Musk is being sued by the social media company to force him to buy it for $44 billion.