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In a legislature, a special session (also extraordinary session) is a period when the body convenes outside of the normal legislative session. This most frequently occurs in order to complete unfinished tasks for the year (often delayed by conflict between political parties), such as outlining the government's budget for the next fiscal year, biennium, or other period. Special sessions may also be called during an economic downturn in order to cut the budget. In other cases, a special session may be convened to address special topics, or emergencies such as war or natural disaster.
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.
In the United States of America, Article II, Section 3 of the United States Constitution gives the President of the United States the power to "on extraordinary occasions, convene both Houses or either of them." 
This power exists for urgent or extraordinary situations that require congressional action when Congress is adjourned. Presidents have exercised this power 46 times to recall only the Senate and 28 times to recall both Chambers of Congress, most recently by Harry Truman in 1948.
The Senate itself differentiates between "extraordinary sessions" called by the Presidential proclamation and "special sessions" that merely indicate a session not normally scheduled. The term "session" can refer to either the formal start and end of a Congressional session or the daily sessions of the chambers of Congress. Thus a formal "special session" will only happen when Congress has adjourned sine die and is not simply in recess (in other words Congress may or may not already be in an official session, but in recess, when convened).
- United States Archives: Transcript of the Constitution
- U.S. Senate History
- "Types of Sessions". Retrieved 26 January 2014.
- Beth, Richard; Tollestrup, Jessica (23 February 2013). "Sessions, Adjournments, and Recesses of Congress" (PDF). Congressional Research Service. pp. Summary. Retrieved 26 January 2014.
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