who has the ability to call for a special legislative session
Special session Who calls a special session varies - by vote of the legislature during regular session, by the executive, or by the legislature's speaker or presiding officer. The United Nations has both special sessions and emergency special sessions.
Standing Rules of the United States Senate When debate concludes, the motion in question is put to a vote. In many cases, the Senate votes by voice vote; the presiding officer puts the question, and Members respond either "Aye!" (in favor of the motion) or "No!" (against the motion). The presiding officer then announces the result of the voice vote. Any senator, however, may challenge the presiding officer's assessment and request a recorded vote. The request may be granted only if it is seconded by one-fifth of the senators present. In practice, however, senators second requests for recorded votes as a matter of courtesy. When a recorded vote is held, the clerk calls the roll of the Senate in alphabetical order; each senator responds when his or her name is called. Senators who miss the roll call may still cast a vote as long as the recorded vote remains open. The vote is closed at the discretion of the presiding officer, but must remain open for a minimum of 15 minutes. If the vote is tied, the Vice President, if present, is entitled to a casting vote. If the Vice President is not present, however, the motion is resolved in the negative.