(2) The committees of Parliament shall include sessional committees and a committee of the whole house. (3) Rules of procedure of Parliament shall prescribe the composition and functions of committees of Parliament. (4) In the exercise of their functions under this article, committees of Parliament— (a) may call any Minister or any person holding public office and private individuals to submit memoranda or appear before them to give evidence; (b) may co-opt any member of Parliament or employ qualified persons to assist them in the discharge of their functions; (c) shall have the powers of the High Court for— (i) enforcing the attendance of witnesses and examining them on oath, affirmation or otherwise; (ii) compelling the production of documents; and (iii) issuing a commission or request to examine witnesses abroad. 91. Exercise of legislative powers. (1) Subject to the provisions of this Constitution, the power of Parliament to make laws shall be exercised through bills passed by Parliament and assented to by the President. (2) A bill passed by Parliament shall, as soon as possible, be presented to the President for assent. (3) The President shall, within thirty days after a bill is presented to him or her— (a) assent to the bill; (b) return the bill to Parliament with a request that the bill or a particular provision of it be reconsidered by Parliament; or (c) notify the Speaker in writing that he or she refuses to assent to the bill. (4) Where a bill has been returned to Parliament under clause (3)(b) of this article, Parliament shall reconsider it and if passed again, it shall be presented for a second time to the President for assent.