A "Congress" is a two year period following a biennial election of all Representatives and one-third of the Senate. The Congress consists of two sessions.
Membership:
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House of Representatives: 435 Representatives
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Senate: 100 Senators (2 for each state)
Unique Roles:
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House of Representatives originates all revenue bills (by constitutional mandate) and, by tradition, all appropriation bills.
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Senate ratifies all treaties and Presidential appointments (by constitutional mandate).
A "bill" is proposed legislation:
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One Representative or Senator "sponsors" a bill.
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Two or more Representatives or Senators "co-sponsor" a bill.
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Once introduced, the bill is numbered sequentially, and then referred to an appropriate committee.
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The committee will usually take no immediate action unless the committee chair is a sponsor or co-sponsor of a bill.
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The committee may hold hearings.
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There may subsequently be a "markup" of the bill.
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"Markup" means an editing or amending of the bill in committee.
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Once it is "reported out" of committee the bill must then be considered on the floor of the chamber.
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If the bill is brought to the House floor, the House Rules Committee may adopt a resolution (which may be debated) stating rules for the consideration of that specific bill on the House floor.
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The Senate has its famous filibuster and cloture procedure.
Conference Committee:
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If the House and Senate vote on similar but not identical bills, a conference committee will meet to draft a bill acceptable to both chambers.
Presidential Approval or Veto:
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Once a bill is approved by both chambers, it is submitted to the President of the United States for her signature.
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If she signs the bill, it either becomes law immediately or on a given effective date.
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If she vetoes the bill, it may still become law if each chamber votes by 2/3's of the membership to override the Presidential veto.
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If Congress is in session and the President fails to sign or veto the bill, it becomes law.
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If Congress adjourns and the President fails to sign the bill within ten days, the result is a veto, known as a "pocket veto."