The Supreme Court signaled in oral arguments Friday that it may uphold the federal ban on TikTok, potentially leaving it up to President-elect Donald Trump to try and keep the app legal once he takes office — but the president-elect has limited options if the law is upheld, and any attempts to stop it could be challenged in court.

TikTok ran into a wave of skepticism Friday when it urged the Supreme Court to strike down a law that could end its presence in the U.S. in one of the most high-profile standoffs of the social media era.

The law that could ban TikTok is coming before the Supreme Court on Friday morning, with the justices largely holding the app’s fate in their hands. Here is the Latest: Why does the US see TikTok as a security threat?