The U.S. Supreme Court heard arguments Friday morning in a case challenging a ban of TikTok in the United States if it is not sold by its owner, ByteDance, which is based in China. TikTok has repeatedly claimed that the law requiring the ban is a violation of First Amendment rights.

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.