Starting Sunday, if the company is not sold, app stores and cloud providers who continue to host it will face billions of dollars in fines.

Users in the U.S. who opened the app were greeted with a message that read, "Sorry, TikTok isn't available right now."

TikTok CEO Shou Zi Chew thanked Donald Trump for his commitment to "finding a solution" that keeps TikTok available in the U.S. after the ruling.

President-elect Donald Trump vowed to issue an executive order on Monday to postpone the ban on TikTok from going into effect.

In April, President Joe Biden signed into law a bill that requires TikTok’s Chinese parent company, ByteDance, to sell the app to a U.S. company or shut down operations in the United States by Sunday, Jan. 19 — arguing that the app poses a risk to national security.

"We go dark. Essentially, the platform shuts down," TikTok lawyer Noel Francisco told the Supreme Court last week. The company also plans to give users an option to download all their data so that they can take a record of their personal information ...

While users who already downloaded the app can access it, TikTok isn’t available for download in the Apple App Store or the Google Play Store. Despite the order, companies like

A law signed by President Joe Biden in April requires TikTok to divest from its Chinese ownership and sell to a U.S. company or it will be shut down. If the Supreme Court declares

The Supreme Court upheld a law that would effectively ban TikTok in the United States. Here's what to know about the potential ban.

The Supreme Court is considering the constitutionality of a law that would ban TikTok for the 170 million people who use the app in the U.S. If the court upholds the law, as other courts have done, the ban will go into effect on Sunday,

TikTok’s only chance of avoiding a ban in the US appears to lie with incoming president Donald Trump. The ByteDance-owned social media app will be removed from Apple and Android app stores on 19 January unless the Chinese firm sells it or the Supreme Court delays a ruling signed into law by outgoing president Joe Biden.

The high court doesn't announce which opinions it is releasing. But the justices are up against a Sunday deadline for TikTok to cut ties with China.