https://www.techradar.com/news/trump-order-bans-us-firms-from-dealing-with-huawei

In a move that will likely add fire to the growing trade war between the US and China, President Trump has declared a “national emergency” to protect US communication networks.

The President's executive order gives the federal government the power to bar American companies from doing business with foreign suppliers that could pose a threat to national security such as the Chinese firm Huawei.