The fate of a law that would likely ban social media platform TikTok in the United States goes before the Supreme Court as the justices consider whether to block it.

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.