The law—which prohibits U.S. app stores from hosting TikTok unless Chinese parent company ByteDance divests from it—is scheduled to take effect one day before Trump’s Jan. 2

WASHINGTON (AP) — The law that could ban TikTok is coming before the Supreme Court on Friday, with the justices largely holding the app’s fate in their hands. The popular social media platform says the law violates the First Amendment and should be struck down.

If the Supreme Court decides not to intervene, TikTok will be unavailable everywhere in the U.S., including in Wisconsin, starting Jan. 19.