The social media platform TikTok shut down its service in the United States shortly before a federal ban took effect at midnight on Sunday.

The company announced the shutdown in a pop-up message on the app that only allows users to “learn more” about the federal law or close the app. The message says, “A law banning TikTok has been enacted in the U.S. Unfortunately, that means you can’t use TikTok for now. We are fortunate that President Trump has indicated that he will work with us on a solution to reinstate TikTok once he takes office. Please stay tuned!”