Mont. Code Ann. § 2-15-137

If any part of a reorganization within the executive branch is ruled to be in conflict with federal requirements which are a prescribed condition to the receipt of federal aid by the state, an agency, or a political subdivision, that part of the reorganization has no effect and the governor may issue an executive order which substitutes for that part to the extent necessary to effectuate the receipt of federal aid. The order is effective until the legislature again acts upon the matter.