The U.S. Supreme Court will hear arguments this week in a case challenging a law that seeks to ban the popular app TikTok in the United States if it is not sold by its owner, Byte Dance, which is based in China.

The briefs, filed a week before oral arguments, offered sharply differing accounts of China’s influence over the site and the role of the First Amendment.

The Supreme Court hears a challenge on Friday to a federal law that will ban TikTok if the Chinese parent company ByteDance doesn’t sell the popular social media app.