A majority of the Supreme Court appeared likely to uphold a controversial ban on TikTok over concerns about its ties to China, with justices lobbing pointed questions at lawyers for the social media app and a group of its content creators.

The court heard 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.

The lawyer for TikTok and its Chinese parent company ByteDance offered a warning during Supreme Court arguments over a law that would compel the sale of the short-video app or ban it in the United States: If Congress could do this to TikTok,