President Donald Trump has declared a national emergency to protect US computer networks from “foreign adversaries”.
The president signed an executive order which effectively bars US companies from using foreign telecoms believed to pose a security risk to the country.
Mr Trump does not name any company specifically in the order.
However, analysts suggest it is mainly directed at Chinese telecommunications giant Huawei.
A number of countries – including the US – have raised concerns that the company’s products could be used by China for surveillance. Huawei has said its work does not pose any threat.
The US is also embroiled in an escalating trade war with China.
What does the order say?
According to a White House statement, Mr Trump’s order aims to “protect America from foreign adversaries who are actively and increasingly creating and exploiting vulnerabilities in information and communications technology infrastructure and services”.
It gives the secretary of commerce the power to “prohibit transactions posing an unacceptable risk to the national security”, the statement adds.
The move was instantly welcomed by Federal Communications Commission Chairman Ajit Pai, who said in a statement it was “a significant step toward securing America’s networks”. Read more