Which of course is open to many interpretations.
I guess you'll have to open up a new branch of gov't which decides which companies are essential to national defense and which are not.
I don't know...there's so many agencies out there maybe one already exists.
The Committee on Foreign Investment in the United States (”CFIUS”) seeks to serve U.S. investment policy through thorough reviews that protect national security while maintaining the credibility of our open investment policy and preserving the confidence of foreign investors here and of U.S. investors abroad that they will not be subject to retaliatory discrimination.
Foreign Investment and National Security Act of 2007
CFIUS MEMBERSHIP- The Committee shall be comprised of the following members or the designee of any such member:
The Secretary of the Treasury.
The Secretary of Homeland Security.
The Secretary of Commerce.
The Secretary of Defense.
The Secretary of State.
The Attorney General of the United States.
The Secretary of Energy.
The Secretary of Labor (nonvoting, ex officio).
The Director of National Intelligence (nonvoting, ex officio).
The heads of any other executive department, agency, or office, as the President determines appropriate, generally or on a case-by-case basis.