Neil O'Brien - co-founder of the China Research Group of Tory MPs - said the intelligence services should publish a report into the matter.

President Trump is threatening to ban TikTok in the US.

This has forced the app to ditch plans to establish its headquarters there.

TikTok had been expected to pick California or New York - where it already has offices - after appointing an American ex-Disney executive as its chief executive in May.

However, the US president has since given it an ultimatum to sell its local business to an American firm.

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