The app is expected to challenge the decision.
Montana’s governor’s signed into law a bill which from January makes it illegal for TikTok to operate in the US state.
Some politicians have been concerned it could be used to give the Chinese government access to information on American citizens or to push misinformation.
The video-sharing app says there's no evidence of that.
It’s expected to challenge the decision in court - arguing it goes against freedom of speech.
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