The Governor may require information in writing, under oath, from any officer of any executive or administrative department, office, or agency, or any public institution upon any subject relating to their respective departments, offices, agencies, or public institutions; and he may inspect at any time their official books, accounts, and vouchers, and ascertain the conditions of the public funds in their charge, and in that connection may employ accountants. He may require the opinion in writing of the Attorney General upon any question of law affecting the official duties of the Governor.