A constitutional amendment to allow the General Assembly to convene in extraordinary session upon the issuance of a joint written proclamation of the speaker of the House of Representatives and the president pro tempore of the Senate or upon the submission of a written proclamation containing the signatures of at least 2/3 of the members of the House of Representatives and at least 2/3 of the members of the Senate to the speaker of the House of Representatives and the president pro tempore of the Senate requesting that the General Assembly convene in extraordinary session.