TikTok plans to shut its app for U.S. users from Sunday, when a federal ban on the social media app could come into effect, unless the Supreme Court moves to block it, people familiar with the matter said.

TikTok's reported plans include giving users a pop-message directing them to a website with information about the ban.

If TikTok doesn't find a buyer before Sunday, Jan 19, it will likely have to stop operation in the U.S. This is due to a law signed by President Biden in April, which requires TikTok parent company Bytedance to sell its U.S. assets by the deadline.