The full scope of how the ban would impact TikTok’s user functions is still unclear, as a lawyer arguing on behalf of the app said it would go dark by Jan. 19.

After the Supreme Court heard oral arguments over a law that could ban TikTok, it looks like one of its last possible lifelines is unlikely to save it from the impending ouster.

Congress, which passed the TikTok law with bipartisan support, says China’s influence over the platform poses a national security threat. The Department of Justice has raised concerns as well, including the potential collection of personal data from the app’s millions of American users and the potential “ covert manipulation ” of its content.