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(2) The Auditor-General shall not be removed from office before such retiring age as may be prescribed by law, save in accordance with the provisions of this section. 88. Power to conduct investigations (1) Subject to the provisions of this Constitution, each House of the National Assembly shall have power by resolution published in its journal or in the Official Gazette of the Government of the Federation to direct or cause to be directed investigation into - (a) any matter or thing with respect to which it has power to make laws; and (b) the conduct of affairs of any person, authority, Ministry or government department charged, or intended to be charged, with the duty of or responsibility for - (i) executing or administering laws enacted by National Assembly, and (ii) disbursing or administering moneys appropriated or to be appropriated by the National Assembly. (2) The powers conferred on the National Assembly under the provisions of this section are exercisable only for the purpose of enabling it to – (a) make laws with respect to any matter within its legislative competence and correct any defects in existing laws; and (b) expose corruption, inefficiency or waste in the execution or administration of laws within its legislative competence and in the disbursement or administration of funds appropriated by it. 89. Power as to matters of evidence (1) For the purposes of any investigation under section 88 of this Constitutional and subject to the provisions thereof, the Senate or the House of Representatives or a committee appointed in accordance with section 62 of this Constitution shall have power to - (a) procure all such evidence, written or oral, direct or circumstantial, as it may think necessary or desirable, and examine all persons as witnesses whose evidence may be material or relevant to the subject matter; 74 The Constitution of the Federal Republic of Nigeria Updated with the First, Second , Third and Fourth Alterations