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In page United States Congress:

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Joint sessions of the United States Congress occur on special occasions that require a concurrent resolution from House and Senate. These sessions include counting electoral votes after a presidential election and the president's State of the Union address. The constitutionally mandated report, normally given as an annual speech, is modeled on Britain's Speech from the Throne, was written by most presidents after Jefferson but personally delivered as a spoken oration beginning with Wilson in 1913. Joint Sessions and Joint Meetings are traditionally presided over by the speaker of the House, except when counting presidential electoral votes when the vice president (acting as the president of the Senate) presides.[citation needed]