TikTok faced off with the U.S. government in federal court on Monday, arguing a law that could ban the platform in a few short months is unconstitutional while the Justice Department said it is needed to eliminate a national security risk posed by the popular social media company.

In a more than two hour appearance before a panel of three judges at a federal appeals court in Washington, attorneys for the two sides – and content creators – were pressed on their best arguments for and against the law that forces the two companies to break ties by mid-January or lose one of their biggest markets in the world.