The Governor shall have power to employ counsel to protect the rights or interests of the state in any action or proceeding, civil or criminal, which has been, or is about to be commenced, and the counsel so employed by him may, under the direction of the Governor, plead in any cause, matter, or proceeding in which the state is interested or a party, may prosecute offenses against the law of the state, and may institute and conduct proceedings before grand juries; provided, that nothing herein contained shall limit the power of courts of record to appoint an attorney to prosecute criminal actions in such courts when the district attorney is disqualified or unable to act.