By Andrew Chung, John Kruzel and David Shepardson WASHINGTON (Reuters) -Supreme Court justices posed tough questions to the lawyer representing TikTok and its Chinese parent company ByteDance on Friday over a law that would force a sale or ban the widely used short-video app by Jan.

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.

TikTok has just ten days until it faces a possible ban in the US. If the Supreme Court declines to halt the law before January 19th, and TikTok isn’t spun off from its Chinese parent company ByteDance, companies like Apple and Google will be forced to stop maintaining the app in their app stores or letting it push updates.