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, Jan. 19.

As self-described "TikTok refugees" pour onto the Chinese social media app RedNote, also known as Xiaohongshu, some foreign netizens are already running up against the country's extensive censorship apparatus.

BEIJING (Reuters) -Chinese social media app RedNote has been thrust into the limelight after more than half a million TikTok users recently joined the platform in protest against a likely imminent ban on the short video app in the United States.

The federal ban on TikTok is set to take effect Sunday unless the Supreme Court steps in to stop it, and while reports Wednesday suggest President-elect Donald Trump is mulling an executive order that would quickly reinstate the app, he may have limited options should the law be upheld—and his attempts to stop it could be challenged in court.

The move is under discussion as the Chinese-owned app faces a Sunday deadline to find a new buyer or shut down in the United States.

Incoming National Security Adviser Mike Waltz says the law allows a 90-day grace period for the app's Chinese owner.