28 No. 2 of 2016] Petition of election of Member of Parliament Constitution of Zambia (Amendment) 73. (1) A person may file an election petition with the High Court to challenge the election of a Member of Parliament. (2) An election petition shall be heard within ninety days of the filing of the petition. (3) A person may appeal against the decision of the High Court to the Constitutional Court. (4) A Member of Parliament whose election is petitioned shall hold the seat in the National Assembly pending the determination of the election petition. Leader of Government Business and Leader of Opposition 74. (1) The President shall appoint the Vice-President to be the Leader of Government Business in the National Assembly. (2) The opposition political party with the largest number of seats in the National Assembly shall elect a Leader of the Opposition from amongst the Members of Parliament who are from the opposition. Proceedings of National Assembly Sittings of National Assembly 75. (1) The Speaker shall, within thirty days after a general election, by notice in the Gazette, appoint a date for the first sitting of the National Assembly for that term. (2) There shall be at least three sittings of the National Assembly in a session of Parliament which shall be held at such times and on such days as the Speaker appoints. (3) Notwithstanding clause (2), the President, or two-thirds of the Members of Parliament, may, in writing, request the Speaker to summon a sitting of the National Assembly, as prescribed. Freedom of speech, powers, privileges and immunities 76. (1) A Member of Parliament has freedom of speech and debate in the National Assembly and that freedom shall not be ousted or questioned in a court or tribunal. (2) A Member of Parliament shall have the powers, privileges and immunities, as prescribed.