A federal appeals court heard arguments Monday in a case that pits the First Amendment against national security. TikTok sued to block a bipartisan-backed law that will ban the Chinese-owned app in the U.S. by January 19 — unless it finds a U.S. buyer. This week, the government argued the app gives China access to Americans’ sensitive data, as well as the ability to spread propaganda. While TikTok argued it’s been unfairly singled out and that a sale isn’t the only way to address security concerns. TikTok touts 170 million users in the U.S., and that includes both candidates for president. A group of U.S.-based creators have also joined as plaintiffs in this lawsuit. Anupam Chander, professor of law and technology at Georgetown University, walked Marketplace’s Meghan McCarty Carino through the arguments in the case.