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.
The US government is arguing that without a sale, TikTok could be used by China as a tool for spying and political manipulation.
But TikTok rejects that claim, arguing it has been unfairly targeted and the measure violates the free speech of its some 170 million American users.
