A congressional session describes the period for which the American federal legislature convenes. Furthermore they are also special Congressional sessions, such as the emergency convening of the legislature.
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congressional record
Because of the presidents power to call a special session
Amendment XX (20)
January 6th
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Keynote Address
The State of the Union address is typically delivered during a joint session of Congress. This means that both the House of Representatives and the Senate come together in the same session to hear the president's speech. It is a significant event in which the president discusses the administration's priorities and provides an update on the nation's status.
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The congressional record