TikTok and its parent company ByteDance are joining forces with the U.S. Justice Department in an urgent legal bid to resolve the platform’s future before a looming national security deadline, Reuters reports.

On Friday, the parties asked the U.S. Court of Appeals for the District of Columbia to rule by December 6 on challenges to a new law requiring ByteDance to divest TikTok’s U.S. assets by January 19 or face a potential ban. This accelerated schedule would allow them to seek Supreme Court review if needed ahead of the January cutoff.

The law prohibits app stores and internet hosts from offering TikTok unless ByteDance sells off the wildly popular app, which boasts 170 million American users. A group of TikTok content creators filed suit this week, claiming the law would have “a profound effect on American life,” Reuters reports.

TikTok and ByteDance launched their own lawsuit on May 7, arguing the divestment requirement violates constitutional free speech protections. With a fast-track schedule, TikTok believes the legal process can conclude without the need for an emergency injunction.

In court filings, the Justice Department said it may submit classified material supporting the divestment push on national security grounds. The White House maintains it seeks to end Chinese ownership of TikTok, but not an outright ban, Reuters reports.