T he fate of TikTok in the United States will soon be in the hands of the Supreme Court, as the Justices hear oral arguments Friday over a law that could shut down the popular social media platform.

TikTok said it will shut down by Jan. 19—the proposed date of the social media app's U.S. ban—if the Supreme Court does not intervene.

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.