Colo. Rev. Stat. § 24-2-106
It is the duty of the governor as the supreme executive power of the state to restrict the number of employees in the various offices, boards, divisions, and agencies of the executive department to the lowest number required for efficient operation thereof. In making any appointment or in approving any appointment made by any other official of the executive department, the governor shall certify in writing that he deems such appointment necessary and for the best interests of the public service. In the exercise of his responsibility, the governor may delegate in writing to some other official the power to approve or disapprove appointments made by other officials of the executive department, subject always to final review by the governor at his option.
C.R.S. § 24-2-106