The county agency must cooperate with tribal governments in the implementation of MFIP to ensure that the program meets the special needs of persons living on Indian reservations. This cooperation must include, but is not limited to, the sharing of MFIP duties including initial screening, orientation, assessments, and provision of employment and training services. The county agency shall encourage tribal governments to assume duties related to MFIP and shall work cooperatively with tribes that have assumed responsibility for a portion of the MFIP program to expand tribal responsibilities, if that expansion is requested by the tribe.