The US Supreme Court has upheld a law that bans TikTok nationwide unless China-based parent company ByteDance sells the platform by this Sunday.
TikTok challenged the law, arguing that it would violate free speech protections for the more than 170 million users the app says it has in the US.
But that argument was rejected by the nation's highest court, meaning TikTok must now find an approved buyer for the US version of the app or face being removed from app stores and web hosting services.
However, the outgoing Biden administration and President-elect Donald Trump have been trying to craft a reprieve for the platform, which US officials have warned poses a national security risk.
Both Democrats and Republicans voted to ban the video-sharing app last year over concerns about its ties to the Chinese government. TikTok has repeatedly said it does not share information with Beijing.
The law gives TikTok's owner, ByteDance, until January 19 to sell the US version of the platform to a neutral country to avoid an outright ban.
That would mean that starting Sunday, Apple and Google would no longer offer the app to new users or provide security updates to current users — which could ultimately kill it.
The company has vowed not to sell TikTok.