115th United States Congress

115th United States Congress
114th ←
→ 116th

January 3, 2017 – January 3, 2019
Members100 senators
435 representatives
6 non-voting delegates
Senate majorityRepublican
Senate PresidentJoe Biden (D)[a]
(until January 20, 2017)
Mike Pence (R)
(from January 20, 2017)
House majorityRepublican
House SpeakerPaul Ryan (R)
Sessions
1st: January 3, 2017 – January 3, 2018
2nd: January 3, 2018 – January 3, 2019
House of Representatives member pin for the 115th U.S. Congress

The 115th United States Congress was a meeting of the legislative branch of the United States of America federal government, composed of the Senate and the House of Representatives. It met in Washington, D.C., from January 3, 2017, to January 3, 2019, during the final weeks of Barack Obama's presidency and the first two years of Donald Trump's presidency. The seats in the House were apportioned based on the 2010 United States census.[1]

The Republican Party retained their majority in both the House and the Senate, and, with inauguration of Donald Trump on January 20, 2017, attained an overall federal government trifecta for the first time since the 109th Congress in 2005. This remains the last Congress to date in which the Republican Party held a trifecta.

Several political scientists described the legislative accomplishments of this Congress as modest, considering that both Congress and the presidency were under unified Republican Party control.[2][3][4][5]

As of 2024, this is the most recent Congress in which Democrats held Senate seats in Florida, Missouri, Indiana and North Dakota, and the last time Republicans held a House seat in Maine, a Senate seat in Nevada, and both of Arizona's Senate seats.


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  1. ^ H.Res. 670, §3(b), and "House Floor Activities | Legislative Days of January 3, 2018". Office of the Clerk of the United States House of Representatives. Archived from the original on February 3, 2020. Retrieved January 4, 2018.
  2. ^ Lee, Frances E. (July 31, 2018). "The 115th Congress and Questions of Party Unity in a Polarized Era". The Journal of Politics. 80 (4): 1464–1473. doi:10.1086/699335. ISSN 0022-3816. S2CID 158939160.
  3. ^ Binder, Sarah (2018). "Dodging the Rules in Trump's Republican Congress". The Journal of Politics. 80 (4): 1454–1463. doi:10.1086/699334. ISSN 0022-3816. S2CID 158183066.
  4. ^ Pearson, Kathryn (January 1, 2017). "President Trump and Congressional Republicans: Uncertain Teamwork in the 115th Congress". The Forum. 15 (3): 513–524. doi:10.1515/for-2017-0033. ISSN 1540-8884. S2CID 149005199.
  5. ^ Edwards III, George C. (January 1, 2017). "No Deal: Donald Trump's Leadership of Congress". The Forum. 15 (3): 451–497. doi:10.1515/for-2017-0031. ISSN 1540-8884. S2CID 199061504.

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