Arguing that “foreign adversaries are increasingly creating and exploiting vulnerabilities in information and communications technology and services” the US increasingly depends on, Trump’s executive order on Wednesday declares an emergency over foreign-designed, developed, manufactured or supplied information and communications technologies.

The emergency order gives the Secretary of Commerce the authority to block any transactions that would pose “undue risk of sabotage to or subversion” of IT or communications technologies and services, or “undue risk of catastrophic effects on the security or resiliency of... critical infrastructure or the digital economy.”

There is also a catch-all provision intended to block anything that “otherwise poses an unacceptable risk to the national security of the US or the security and safety” of Americans.