Elon Musk's legal team's attorneys will question

Peiter Zatko, a whistleblower in the ongoing lawsuit against Twitter.

For the testimony on September 9 in Elon Musk's legal action against Twitter regarding the Purchase transaction

The former director of security at Twitter, Peiter Mudge Zatko, has been summoned.

Days after Zatko made the social media company publically aware of its 

serious privacy and security flaws that could endanger users. 

The subpoena, which put investors and US national security at risk,

was received on Thursday and made public on Monday. 

The disclosure could not have come at a better time for Musk, 

who is currently involved in a legal dispute with Twitter.