The Supreme Court upheld a law today that could ban the wildly popular social media app TikTok in the U.S. starting on Sunday, unless its Chinese owner agrees to sell it before then. The justices unanimously rejected TikTok’s First Amendment challenge and argued that Congress was entitled to effectively outlaw the app for national security reasons.

After the Supreme Court upheld a law that would force a sale of the video platform's U.S. assets or start a ban on Sunday, advertisers seek alternatives.

Citing national security, the Supreme Court rules that TikTok can be banned if its Chinese parent company ByteDance does not sell the app by Sunday.