Constitution of the Republic of China (Taiwan) Article 30

An extraordinary session of the National Assembly shall be convoked in any of the following circumstances:1. When, in accordance with the provisions of Article 49 of this Constitution, a new President and a new Vice President are to be elected;2. When, by resolution of the Control Yuan, an impeachment of the President or the Vice President is instituted;3. When, by resolution of the Legislative Yuan, an amendment to the Constitution is proposed; and4. When a meeting is requested by not less than two-fifths of the delegates to the National Assembly.When an extraordinary session is to be convoked in accordance with Item 1 or Item 2 of the preceding paragraph, the President of the Legislative Yuan shall issue the notice of convocation; when it is to be convoked in accordance with Item 3 or Item 4, it shall be convoked by the President of the Republic.