On Friday, the nation's highest court heard arguments on whether to uphold or block a law that could effectively ban TikTok​ in the U.S. The bill, signed

Congress says the popular video app poses a looming threat to the nation’s security because of its Chinese owner. What the justices decide could determine if the app is shut down.

The court is hearing oral arguments on TikTok’s bid to block a law that would lead to its ban in the U.S. starting Jan. 19 if it isn’t sold by its Chinese owner.