Tesla Inc Chief Executive Officer Elon Musk sold $6.9 billion worth of shares in the electric vehicle maker, saying the funds could be used to finance a potential Twitter deal if he loses a legal battle with the social media platform.

Elon Musk recently challenged Twitter CEO Parag Agrawal to a public debate about the percentage of bots on the social media platform.

Elon Musk, the world’s richest man, said that if Twitter could provide its method of sampling 100 accounts and how it confirmed that the accounts are real, his $44 billion deal to buy the company should proceed on its original terms.