TikTok said it would “go dark” on Sunday unless President Joe Biden’s administration offered assurance that it would not enforce a ban upheld Friday by the Supreme Court for the app’s U.S. operations to be sold or booted over “national security concerns.

As a ban looms over the social media app and its 170 million users, TikTok said it will be “forced to go dark” on Sunday unless the Biden administration explicitly declares that it will not enforce the ban.

Congress last year in a law signed by President Joe Biden required that TikTok’s China-based parent company ByteDance divest the company by Jan. 19 or risk getting banned in the U.S.