Washington — The Supreme Court on Friday upheld a new law that would lead to a ban of the social media platform TikTok, clearing the way for the widely popular app to shutter in the U.S. as soon as Sunday.

TikTok said it will be "forced to go dark" on Jan. 19 unless the Biden administration guarantees the divest-or-ban law won’t be enforced.

TikTok’s app and website effectively shut down in the United States late Saturday just before a nationwide ban against the video-sharing platform came into force. The company showed its millions of American users a pop-up message that thanked President-elect Donald Trump for indicating he will work with the company on a solution when he takes office on Monday.

President-elect Donald Trump vowed to issue an executive order on Monday to postpone the ban on TikTok from going into effect.

TikTok went offline in the United States Saturday night, less than two hours before a ban was slated to go into effect.