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United States Senate
United States government

United States Senate

United States government

United States Senate, one of the two houses of the legislature (Congress) of the United States, established in 1789 under the Constitution. Each state elects two senators for six-year terms. The terms of about one-third of the Senate membership expire every two years, earning the chamber the nickname “the house that never dies.”

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Constitutional framework

The role of the Senate was conceived by the Founding Fathers as a check on the popularly elected House of Representatives. Thus, each state, regardless of size or population, is equally represented. Further, until the Seventeenth Amendment of the Constitution (1913), election to the Senate was indirect, by the state legislatures. They are now elected directly by voters of each state.

The Senate shares with the House of Representatives responsibility for all lawmaking within the United States. For an act of Congress to be valid, both houses must approve an identical document.

The Senate is given important powers under the “advice and consent” provisions (Article II, section 2) of the Constitution: ratification of treaties requires a two-thirds majority of all senators present and a simple majority for approval of important public appointments, such as those of cabinet members, ambassadors, and justices of the Supreme Court. The Senate also adjudicates impeachment proceedings initiated in the House of Representatives, a two-thirds majority being necessary for conviction.

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Organization and powers

As in the House of Representatives, political parties and the committee system dominate procedure and organization. Each party elects a leader, generally a senator of considerable influence in his or her own right, to coordinate Senate activities. The leader of the largest party is known as the majority leader, while the opposition leader is known as the minority leader. The Senate leaders also play an important role in appointing members of their party to the Senate committees, which consider and process legislation and exercise general control over government agencies and departments. The vice president of the United States serves as the president of the Senate but can vote only in instances where there is a tie. In the vice president’s absence, the president pro tempore—generally the longest-serving member from the majority party—is the presiding officer of the Senate.

Sixteen standing committees are grouped mainly around major policy areas, each having staffs, budgets, and various subcommittees. The chair of each committee is a member of the majority party. Among important standing committees are those on appropriations, finance, government operations, foreign relations, and the judiciary. Thousands of bills are referred to the committees during each session of Congress, though the committees take up only a fraction of these bills. At “mark-up” sessions, which may be open or closed, the final language for a law is considered. The committees hold hearings and call witnesses to testify about the legislation before them. Select and special committees are also created to make studies or to conduct investigations and report to the Senate; these committees cover aging, ethics, Indian affairs, and intelligence.

The smaller membership of the Senate permits more extended debate than is common in the House of Representatives. To check a filibuster—endless debate obstructing legislative action—three-fifths of the membership (60 senators) must vote for cloture. (In 2013 the Senate rule for invoking cloture was reinterpreted to permit cloture by majority vote for debate regarding all presidential nominations except those to the Supreme Court, and in 2017 the rule was similarly reinterpreted for Supreme Court nominations.) If the legislation under debate would change the Senate’s standing rules, cloture may be invoked only on a vote of two-thirds of those present. There is a less elaborate structure of party control in the Senate; the position taken by influential senators may be more significant than the position (if any) taken by the party.

The constitutional provisions regarding qualifications for membership of the Senate specify a minimum age of 30, citizenship of the United States for nine years, and residence in the state from which elected.

U.S. senators

The table provides a list of current U.S. senators.

United States Senate, 116th Congress
Party totals: Democrats (D) 45; Republicans (R) 53; Independents (I) 2
state senator (party) service began term ends
1Luther Strange was appointed in February 2017 to replace Jeff Sessions, who resigned to become U.S. attorney general. In December 2017 Doug Jones won a special election, and he took office the following month.
2Martha McSally was appointed in December 2018 and took office the following month to fill the vacancy caused by the resignation of Jon Kyl, who had been appointed in September 2018 to fill the vacancy caused by the death of John McCain. A special election was scheduled for 2020.
3Dianne Feinstein was elected in November 1992 to complete the term of Pete Wilson, who resigned in 1991 to become California's governor.
4Michael F. Bennet was appointed in January 2009 to complete the term of Ken Salazar, who resigned to become secretary of the interior.
5Ted Kaufman was appointed in January 2009 to replace Joe Biden, who resigned to become vice president. In 2010 Chris Coons won a special election to complete the term.
6Brian Schatz was appointed in December 2012 to fill the vacancy caused by the death of Daniel Inouye.
7William Cowan was appointed in January 2013 and took office in February to replace John Kerry, who resigned to become secretary of state. In July 2013 Ed Markey won a special election to complete the term.
8Tina Smith was appointed in December 2017 and took office in January 2018 to fill the vacancy caused by the resignation of Al Franken.
9Roger Wicker was appointed in December 2007 to fill the vacancy caused by the resignation of Trent Lott.
10Cindy Hyde-Smith was appointed in March 2018 and took office in April to fill the vacancy caused by the resignation of Thad Cochran.
11Robert Menendez was appointed in January 2006 to fill the vacancy caused by the resignation of Jon S. Corzine.
12Jeff Chiesa was appointed in June 2013 to fill the vacancy caused by the death of Frank R. Lautenberg. In October 2013 Cory Booker won a special election to complete the term.
13Kirsten Gillibrand was appointed in January 2009 to replace Hillary Rodham Clinton, who resigned to become secretary of state.
14James M. Inhofe was elected in November 1994 to complete the term of David Boren, who resigned to become president of the University of Oklahoma.
15Ron Wyden was elected in January 1996 to complete the term of Bob Packwood, who resigned in 1995.
16Tim Scott was appointed in December 2012 and took office in January 2013 to fill the vacancy caused by the retirement of Jim DeMint.
17Joseph Manchin won a special election in 2010 to fill the vacancy caused by the death of Robert C. Byrd.
18John Barrasso was appointed in June 2007 to fill the vacancy caused by the death of Craig Thomas.
Alabama Richard Shelby (R) 1987 2023
Doug Jones (D) 20181 2021
Alaska Lisa Murkowski (R) 2002 2023
Dan Sullivan (R) 2015 2021
Arizona Kyrsten Sinema (D) 2019 2025
Martha McSally (R) 20192 2023
Arkansas John Boozman (R) 2011 2023
Tom Cotton (R) 2015 2021
California Dianne Feinstein (D) 19923 2025
Kamala Harris (D) 2017 2023
Colorado Michael F. Bennet (D) 20094 2023
Cory Gardner (R) 2015 2021
Connecticut Richard Blumenthal (D) 2011 2023
Chris Murphy (D) 2013 2025
Delaware Tom Carper (D) 2001 2025
Chris Coons (D) 20105 2021
Florida Marco Rubio (R) 2011 2023
Rick Scott (R) 2019 2025
Georgia Johnny Isakson (R) 2005 2023
David Perdue (R) 2015 2021
Hawaii Mazie Hirono (D) 2013 2025
Brian Schatz (D) 20126 2023
Idaho Mike Crapo (R) 1999 2023
James E. Risch (R) 2009 2021
Illinois Dick Durbin (D) 1997 2021
Tammy Duckworth (D) 2017 2023
Indiana Todd Young (R) 2017 2023
Mike Braun (R) 2019 2025
Iowa Chuck Grassley (R) 1981 2023
Joni Ernst (R) 2015 2021
Kansas Pat Roberts (R) 1997 2021
Jerry Moran (R) 2011 2023
Kentucky Mitch McConnell (R) 1985 2021
Rand Paul (R) 2011 2023
Louisiana Bill Cassidy (R) 2015 2021
John Kennedy (R) 2017 2023
Maine Susan Collins (R) 1997 2021
Angus King (I) 2013 2025
Maryland Benjamin L. Cardin (D) 2007 2025
Chris Van Hollen (D) 2017 2023
Massachusetts Elizabeth Warren (D) 2013 2025
Ed Markey (D) 20137 2021
Michigan Debbie Stabenow (D) 2001 2025
Gary Peters (D) 2015 2021
Minnesota Amy Klobuchar (D) 2007 2025
Tina Smith (D) 20188 2021
Mississippi Roger Wicker (R) 20079 2025
Cindy Hyde-Smith (R) 201810 2021
Missouri Roy Blunt (R) 2011 2023
Josh Hawley (R) 2019 2025
Montana Jon Tester (D) 2007 2025
Steve Daines (R) 2015 2021
Nebraska Deb Fischer (R) 2013 2025
Ben Sasse (R) 2015 2021
Nevada Catherine Cortez Masto (D) 2017 2023
Jacky Rosen (D) 2019 2025
New Hampshire Jeanne Shaheen (D) 2009 2021
Maggie Hassan (D) 2017 2023
New Jersey Robert Menendez (D) 200611 2025
Cory Booker (D) 201312 2021
New Mexico Tom Udall (D) 2009 2021
Martin Heinrich (D) 2013 2025
New York Charles E. Schumer (D) 1999 2023
Kirsten Gillibrand (D) 200913 2025
North Carolina Richard Burr (R) 2005 2023
Thom Tillis (R) 2015 2021
North Dakota John Hoeven (R) 2011 2023
Kevin Cramer (R) 2019 2025
Ohio Sherrod Brown (D) 2007 2025
Rob Portman (R) 2011 2023
Oklahoma James M. Inhofe (R) 199414 2021
James Lankford (R) 2015 2021
Oregon Ron Wyden (D) 199615 2023
Jeff Merkley (D) 2009 2021
Pennsylvania Robert P. Casey (D) 2007 2025
Pat Toomey (R) 2011 2023
Rhode Island Jack Reed (D) 1997 2021
Sheldon Whitehouse (D) 2007 2025
South Carolina Lindsey Graham (R) 2003 2021
Tim Scott (R) 201316 2021
South Dakota John Thune (R) 2005 2023
Mike Rounds (R) 2015 2021
Tennessee Lamar Alexander (R) 2003 2021
Marsha Blackburn (R) 2019 2025
Texas John Cornyn (R) 2002 2021
Ted Cruz (R) 2013 2025
Utah Mike Lee (R) 2011 2023
Mitt Romney (R) 2019 2025
Vermont Patrick Leahy (D) 1975 2023
Bernie Sanders (I) 2007 2025
Virginia Mark R. Warner (D) 2009 2021
Tim Kaine (D) 2013 2025
Washington Patty Murray (D) 1993 2023
Maria Cantwell (D) 2001 2025
West Virginia Joseph Manchin (D) 201017 2025
Shelley Moore Capito (R) 2015 2021
Wisconsin Ron Johnson (R) 2011 2023
Tammy Baldwin (D) 2013 2025
Wyoming Mike Enzi (R) 1997 2021
John Barrasso (R) 200718 2025
The Editors of Encyclopaedia Britannica This article was most recently revised and updated by Amy McKenna, Senior Editor.
United States Senate
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