The Supreme Court seemed inclined on Friday to uphold a law that would force a sale or ban the popular short-video app TikTok in the United States by Jan. 19, with the justices focusing on the national security concerns about China that prompted the crackdown.

The Supreme Court seems likely to uphold a law that would ban TikTok in the United States beginning Jan. 19 unless the popular social media program is sold by its China-based parent company.

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.