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42 U.S. Code § 2165 - Security restriction
(e) Presidential investigation
(1) If the President deems it to be in the national interest he may from time to time determine that investigations of any group or class which are required by subsections (a), (b), and (c) of this section be made by the Federal Bureau of Investigation.
(2) In the case of an individual employed in a program known as a Special Access Program, any investigation required by subsections (a), (b), and (c) of this section shall be made by the Federal Bureau of Investigation
(h) War time clearance
Whenever the Congress declares that a state of war exists, or in the event of a national disaster due to enemy attack, the Commission is authorized during the state of war or period of national disaster due to enemy attack to employ individuals and to permit individuals access to Restricted Data pending the investigation report, and determination required by subsection (b), to the extent that and so long as the Commission finds that such action is required to prevent impairment of its activities in furtherance of the common defense and security.
https://www.law.cornell.edu/uscode/text/42/2165