TikTok ban: The US Supreme Court has upheld a law that bans TikTok nationwide unless its China-based parent company ByteDance sells the platform by this Sunday. The outgoing Biden administration and incoming President Donald Trump have been trying to work out a reprieve for the platform, which US authorities have warned poses a national security risk. App will become unavailable in the US on 19 January, unless Trump directs justice department not to enforce the law.