(Reuters) -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, sources familiar with the matter said.

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.

TikTok will shut down entirely in the US on Sunday without intervention from the US Supreme Court, unnamed sources have told Reuters. That would go beyond the ban’s requirement for app stores to stop offering downloads of the app, but not immediately halt use of it.