“ Sec. 2. The Director of the Office of Management and Budget is designated and empowered to exercise, without the approval, ratification, or other action of the President, the authority of the President under 5 U.S.C. 5377 (i) (2) , as added by section 2 (34) of Public Law 102-378, to designate one or more categories of positions within an agency to be treated as critical positions within the meaning of 5 U.S.C. 5377 (a) (2) . ”