The justices will review a law that would effectively shut down TikTok in the United States this month unless the company divests from Chinese ownership.

TikTok will appear before the US Supreme Court on Friday in a last-ditch effort to overturn a ban, in a case testing the limits of national security and free speech. The popular social media platform is challenging a law passed last year ordering the firm to be split from its Chinese owner or be blocked from the US by 19 January.

On Friday, TikTok will get the chance to argue its case before the Supreme Court, which is deciding whether the government can ban the platform if it doesn’t sever ties with China. With the app’s fate hanging in the balance,