TikTok’s Chinese parent company faces a ban in the US next month as a result of a federal appeals court ruling Friday, ratcheting up a political clash over the wildly popular video-sharing app.

A three-judge panel in Washington unanimously upheld a new US law, ruling that it didn’t violate free speech protections under the Constitution’s First Amendment. Unless the company is sold, the decision leaves the Supreme Court as the company’s last realistic hope for stopping the ban from taking effect on Jan. 19.