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(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 of Assembly or the committee, and order him to pay all costs which may have been occasioned in compelling his attendance or by reason of his failure, refusal or neglect to obey the summons and also to impose such fine as may be prescribed for any such failure, refusal or neglect; and any fine so imposed shall be recoverable in the same manner as a fine imposed by a court of law. (2) A summons or warrant issued under this section may be served or executed by any member of the Nigeria Police Force or by any person authorised in that behalf by the Speaker of the House of Assembly of the State. CHAPTER VI The Executive PART I Federal Executive A - The President of the Federation 130. Establishment of the office of President (1) There shall be for the Federation a President. (2) The President shall be the Head of State and the Chief Executive of the Federation and Commander-in-Chief of the Armed Forces of the Federation. The Constitution of the Federal Republic of Nigeria Updated with the First, Second , Third and Fourth Alterations 93