A primer from your gov.
http://www.treasury.gov/offices/international-affairs/exon-florio/Committee on Foreign Investments in the United States (CFIUS)
U.S. DEPARTMENT OF TREASURY
OFFICE OF THE ASSISTANT SECRETARY INTERNATIONAL AFFAIRS
OFFICE OF INTERNATIONAL INVESTMENT
EXON-FLORIO PROVISION
Introduction. The United States has traditionally welcomed Foreign Direct Investment (FDI) and provided foreign investors fair, equitable and nondiscriminatory treatment with few limited exceptions designed to protect national security. The Exon-Florio provision is implemented within the context of this open investment policy. The intent of Exon-Florio is not to discourage FDI generally, but to provide a mechanism to review and, if the President finds necessary, to restrict FDI that threatens the national security.
The Exon-Florio provision is implemented by the Committee on Foreign Investment in the United States ("CFIUS"), an inter-agency committee chaired by the Secretary of Treasury. 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.
The Statute. Section 5021 of the Omnibus Trade and Competitiveness Act of 1988 amended Section 721 of the Defense Production Act of 1950 to provide authority to the President to suspend or prohibit any foreign acquisition, merger or takeover of a U.S. corporation that is determined to threaten the national security of the United States. The President can exercise this authority under section 721 (also known as the "Exon-Florio provision") to block a foreign acquisition of a U.S. corporation only if he finds:
(1) there is credible evidence that the foreign entity exercising control might take action that threatens national security, and............
Ms. Gay Hartwell Sills
Staff Chair
Committee on Foreign Investment in the United States ("CFIUS")
Office of International Investment
Department of Treasury
1500 Pennsylvania Avenue, N.W., Room 4201 NY
Washington, DC 20220
Phone: (202) 622-9066
Also: (202) 622-1860
E-Mail: gay.sills@do.treas.gov