The company that owns TikTok goes to the U.S. Supreme Court on Friday to try to fend off a new law that would see the wildly popular social media app banned later this month.

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.

In one of the most important cases of the social media age, free speech and national security collide at the Supreme Court on Friday in arguments over the fate of TikTok, a wildly popular digital platform that roughly half the people in the United States use for entertainment and information.