The Supreme Court on Friday seemed 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.

A majority of the justices appeared more concerned about the national security implications of the popular app’s Chinese ownership than about the restrictions on free speech the law would impose.

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.