Donald Trump has ordered a ban of “transactions” with the owners of the Chinese apps TikTok and WeChat.The orders – which come into force in 45 days – remain vague but could potentially involve the removal of the apps from the Apple and Google app stores.The US President previously threatened a deadline of September 15 to “close down” the app unless Microsoft or “somebody else” purchased it.TikTok, which is wildly popular among young people, is owned by the Chinese company ByteDance.