Banning TikTok takes a big tool away from Chinese surveillance work: US NSA

'China is going to know everything about you,' says Robert O'Brien on Fox TV show.

Banning mobile applications such as TikTok by countries like India takes a big tool away from the surveillance work of China, a top White House official said on Tuesday.

The Trump administration is "very seriously taking a look" at TikTok, WeChat and some other apps coming out of China, US National Security Advisor Robert O'Brien told Fox News Radio in an interview.

"India has already banned those apps, as you know. And if they lose India and the United States, they lose some western European countries, that takes a big tool away from the espionage work or the surveillance work of the