TikTok says it will continue trying to get judges to stop a new law which would ban the app in the US from mid-January.
It's after politicians decided there was too much risk of users data going to China's government.
The video app is due to be banned in the US from January after a US court rejected an attempt by the social media company to change the decision.
Politicians from both major US political parties supported a law that bans TikTok unless the company that owns it agrees to sell to a non-Chinese company.