Tesla chief Elon Musk asked a Delaware court Friday to reject a bid by Twitter to put their $44 billion merger lawsuit on trial in September, instead asking to push it back until next year.

In a court document cited by US media, Musk's lawyers accuse Twitter's board of directors of wanting to expedite the case.

The suit filed in the US state of Delaware urges the court to order the billionaire to complete his deal to buy Twitter, arguing that no financial penalty could repair the damage he has caused.

The social media giant wants to hold the trial in September so as not to prolong the period of uncertainty currently threatening the company.

But Musk asked that the trial not start before February 13, citing the complexities involved. Musk's lawyers did not immediately respond to a request by AFP for comment.

The billionaire had agreed to buy Twitter at the end of April.

But after weeks of threats, Musk last week tried to pull the plug on the deal, accusing Twitter of "misleading" statements about the number of fake accounts.

The social network says the number of fake accounts is less than five percent, a figure challenged by Musk, who says he believes the percentage is much higher. His lawyers say proving that will require analyzing mountains of data. A preliminary hearing is scheduled for Tuesday in a business law court in Delaware.