Tenn. Code Ann. § 3-3-107

When, under the authority of this chapter, any such committee shall designate, out of its own membership, any such subcommittee or subcommittees to act for it and to proceed with its work and investigation as provided in § 3-3-106, then such committee, from among its authorized aides, shall designate necessary sergeants-at-arms, counsel, investigators, clerks and stenographers, who shall attend upon the work of any such subcommittee and give to it the necessary and proper aid and assistance in the performance of its duties, as ordered and directed by the committee, so designating from its membership such subcommittee or subcommittees.