US President Donald Trump signed an executive order Wednesday that effectively prohibits US companies from using any telecoms equipment manufactured by China’s Huawei.

The executive order, which has been under consideration for a year, cites the International Emergency Economics Power Act, a law enacted in 1977 that gives the president broad power to control trade in response to a national emergency.

The order does not mention any countries or companies by name. It instead creates a review process that allows the US commerce secretary to review any transactions involving companies that are viewed as posing a security threat to the country, which would include Huawei.

Chinese Foreign Ministry spokesman Geng Shuang said during a daily briefing in Beijing on Wednesday that “for some time, the US has been abusing its national power to tarnish the image of and crack down on specific Chinese companies.” Nevertheless, the United States has been actively pushing other countries not to use Huawei’s equipment in next-generation 5G networks that it calls “untrustworthy.”