In a collision between free speech and national security, the Supreme Court will hear arguments over the fate of TikTok, a digital age cultural phenomenon that roughly half the U.S. population uses for entertainment and information.

The law that could ban TikTok is coming before the Supreme Court. The justices largely hold the app’s fate in their hands as they hear the case Friday.

In response to concerns that China can use the platform to spy on Americans and spread propaganda, Congress last year passed a law requiring TikTok’s parent company to sell it to a non-Chinese owner. TikTok and the parent company, ByteDance, then sued to block the law. This morning, the Supreme Court will hear arguments in the case.