Westinghouse is a nuclear energy company who is filing for bankruptcy protection, it is currently based in Japan and the Trump administration is very concerned that China may try and buy it. The problem with that is that there are many important nuclear energy secrets in these power plants that China will then have access to without having to discover them themselves or through theft. This is concerning because China is rapidly growing and seeking to catch up to the US on nuclear energy output. Japan also is concerned about China catching up and surpassing their nuclear technology.