"The basic TikTok will stay intact until November 12," Commerce Secretary Wilbur Ross told Fox Business Network.

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The department said the actions will "protect users in the US by eliminating access to these applications and significantly reducing their functionality".

Oracle shares fell 1.6 per cent after the news in pre-market trading

The Commerce Department order will "deplatform" the two apps in the US and bar Apple's app store, Alphabet Google Play and others from offering the apps on any platform "that can be reached from within the United States," a senior Commerce official told Reuters.

The order will not ban US companies from doing businesses on WeChat outside the US, which will be welcome news to US firms like Walmart and Starbucks that use WeChat's embedded 'mini-app' programs to facilitate transactions and engage consumers in China, officials said.

The order will not bar transactions with WeChat-owner Tencent Holdings' other businesses, including its online gaming operations, and will not prohibit Apple, Google or others from offering TikTok or WeChat apps anywhere outside the US.

The bans are in response to a pair of executive orders issued by Trump on August 6 that gave the Commerce Department 45 days to determine what transactions to block from the apps he deemed pose a national security threat. That deadline expires on Sunday.

Commerce Department officials said they were taking the extraordinary step because of the risks the apps' data collection poses. China and the companies have denied US user data is collected for spying.

Ross said in a written statement "we have taken significant action to combat China's malicious collection of American citizens' personal data, while promoting our national values, democratic rules-based norms, and aggressive enforcement of US laws and regulations".