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(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; (b) require such evidence to be given on oath; (c) summon any person in Nigeria to give evidence at any place or produce any document or other thing in his possession or under his control, and examine him as a witness and require him to produce any document or other thing in his possession or under his control, subject to all just exceptions; and (d) issue a warrant to compel the attendance of any person who, after having been summoned to attend, fails, refuses or neglects to do so and does not excuse such failure, refusal or neglect to the satisfaction of the House or the committee in question, and order him to pay all costs which may have been occasioned in The Constitution of the Federal Republic of Nigeria Updated with the First, Second, Third, Fourth and Fifth Alterations 75