WASHINGTON—The Supreme Court on Friday voiced skepticism of TikTok’s challenge to a federal law requiring the China-based social-media app to shut down or find new owners by Jan. 19. The court heard oral arguments on the constitutionality of the bipartisan bill President Biden signed last April that classifies the app,

The court heard 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.

The law that could ban TikTok is coming before the Supreme Court. The justices largely hold the app’s fate in their hands as they hear the case Friday.