LXVI Legislature of the Mexican Congress

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LXVI Legislature of the Mexican Congress

The LXVI Legislature of the Congress of the Union (66th Congress) is the current session of the legislative branch of Mexico, composed of the Chamber of Deputies and the Senate of the Republic. It convened on 1 September 2024, and will end on 31 August 2027,[1] covering the final month of Andrés Manuel López Obrador's term in office and the first three years of Claudia Sheinbaum's presidency.

Quick Facts 66th Congress, Overview ...
66th Congress
(LXVI Legislatura)
65th 67th
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Overview
Legislative bodyCongress of the Union
Term1 September 2024 (2024-09-01) – 31 August 2027 (2027-08-31)
Election2 June 2024
Senate
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Members128 senators
President
Chamber of Deputies
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Members500 deputies
President
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Both chambers of Congress were elected in the 2024 general election. There were three competing forces: the Sigamos Haciendo Historia coalition, consisting of the National Regeneration Movement (Morena), the Labor Party (PT), and the Ecologist Green Party of Mexico (PVEM); the Fuerza y Corazón por México coalition, comprising the National Action Party (PAN), the Institutional Revolutionary Party (PRI), and the Party of the Democratic Revolution (PRD); and the Citizens' Movement (MC), the only party to run without allies.

Sigamos Haciendo Historia won a supermajority in the Chamber of Deputies, granting the ruling coalition 73% of the seats, the highest share since the LII Legislature in 1982, during Miguel de la Madrid's presidency.[2] Although the coalition fell three seats short of a supermajority in the Senate, defections by two senators elected for the PRD on 28 August closed the gap to one.[3] The supermajority was ultimately secured with the defection to Morena of Cynthia López, elected for the PRI in Mexico City, on 12 November.[4] This marked the first time since the LIII Legislature in 1985 that the ruling coalition held a supermajority in both chambers.[5]

Major events

Major legislation

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Constitutional amendments

More information DOF Citation, Official title ...
DOF Citation Official title Votes Published
Deputies Senate
15-09-2024 A decree to amend, add, and repeal various provisions of the Political Constitution of the United Mexican States, regarding the reform of the Judicial Branch

Decreto por el que se reforman, adicionan y derogan diversas disposiciones de la Constitución Política de los Estados Unidos Mexicanos, en materia de reforma del Poder Judicial

4 September 2024
(357–130)
11 September 2024
(86–41)
15 September 2024
30-09-2024 A decree to amend, add, and repeal various provisions of the Political Constitution of the United Mexican States, regarding Indigenous and Afro-Mexican Peoples and Communities

Decreto por el que se reforman, adicionan y derogan diversas disposiciones del artículo 2o. de la Constitución Política de los Estados Unidos Mexicanos, en materia de Pueblos y Comunidades Indígenas y Afromexicanos

18 September 2024
(483–0)
24 September 2024
(128–0)
30 September 2024
30-09-2024 A decree to amend and add Articles 13, 16, 21, 32, 55, 73, 76, 78, 82, 89, 123, and 129 of the Political Constitution of the United Mexican States, regarding the National Guard

Decreto por el que se reforman y adicionan los artículos 13, 16, 21, 32, 55, 73, 76, 78, 82, 89, 123 y 129 de la Constitución Política de los Estados Unidos Mexicanos, en materia de Guardia Nacional

19 September 2024
(353–126)
24 September 2024
(86–42)
30 September 2024
30-10-2024 A decree to amend the fourth paragraph and add a fifth paragraph to Article 28 of the Political Constitution of the United Mexican States, regarding railways and railway transportation

Decreto por el que se reforma el párrafo cuarto y se adiciona un párrafo quinto al artículo 28 de la Constitución Política de los Estados Unidos Mexicanos, en materia de vías y transporte ferroviario

8 October 2024
(472–0)
16 October 2024
(123–0)
30 October 2024
31-10-2024 A decree to amend the fifth paragraph of Article 25, the sixth and seventh paragraphs of Article 27, and the fourth paragraph of Article 28 of the Political Constitution of the United Mexican States, regarding strategic areas and enterprises

Decreto por el que se reforman el párrafo quinto del artículo 25, los párrafos sexto y séptimo del artículo 27 y el párrafo cuarto del artículo 28 de la Constitución Política de los Estados Unidos Mexicanos, en materia de áreas y empresas estratégicas

9 October 2024
(350–111)
16 October 2024
(86–39)
31 October 2024
31-10-2024 A decree to amend the first paragraph of Section II of Article 107 and add a fifth paragraph to Article 105 of the Political Constitution of the United Mexican States, regarding the unchallengeability of additions or amendments to the Federal Constitution

Decreto por el que se reforma el primer párrafo de la fracción II del artículo 107, y se adiciona un quinto párrafo al artículo 105, de la Constitución Política de los Estados Unidos Mexicanos, en materia de inimpugnabilidad de las adiciones o reformas a la Constitución Federal

30 October 2024
(343–129)
24 October 2024
(85–41)
31 October 2024
15-11-2024 A decree to amend and add Articles 4, 21, 41, 73, 116, 122, and 123 of the Political Constitution of the United Mexican States, regarding substantive equality, gender perspective, women's right to a life free of violence, and the elimination of the gender pay gap

Decreto por el que se reforman y adicionan los artículos 4o., 21, 41, 73, 116, 122 y 123 de la Constitución Política de los Estados Unidos Mexicanos, en materia de igualdad sustantiva, perspectiva de género, derecho de las mujeres a una vida libre de violencia y erradicación de la brecha salarial por razones de género

5 November 2024
(468–0)
24 October 2024
(126–0)
15 November 2024
02-12-2024 A decree to amend and add Articles 4 and 27 of the Political Constitution of the United Mexican States, regarding well-being

Decreto por el que se reforman y adicionan los artículos 4o. y 27 de la Constitución Política de los Estados Unidos Mexicanos, en materia de bienestar

22 October 2024
(408–65)
30 October 2024
(117–0)
2 December 2024
02-12-2024 A decree to amend and add Section XII of Subsection A of Article 123 of the Political Constitution of the United Mexican States, regarding housing for workers

Decreto por el que se reforma y adiciona la fracción XII del Apartado A del artículo 123 de la Constitución Política de los Estados Unidos Mexicanos, en materia de vivienda para las personas trabajadoras

23 October 2024
(472–0)
31 October 2024
(103–0)
2 December 2024
02-12-2024 A decree to amend and add Articles 3, 4, and 73 of the Political Constitution of the United Mexican States, regarding animal protection and care

Decreto por el que se reforman y adicionan los artículos 3o, 4o y 73 de la Constitución Política de los Estados Unidos Mexicanos, en materia de protección y cuidado animal

12 November 2024
(441–0)
21 November 2024
(118–0)
2 December 2024
20-12-2024 A decree to amend, add, and repeal various provisions of the Political Constitution of the United Mexican States, regarding organizational simplification

Decreto por el que se reforman, adicionan y derogan diversas disposiciones de la Constitución Política de los Estados Unidos Mexicanos, en materia de simplificación orgánica

20 November 2024
(332–119)
28 November 2024
(86–40)
20 December 2024
31-12-2024 A decree to amend the second paragraph of Article 19 of the Political Constitution of the United Mexican States, regarding mandatory pretrial detention

Decreto por el que se reforma el párrafo segundo del artículo 19 de la Constitución Política de los Estados Unidos Mexicanos, en materia de prisión preventiva oficiosa

13 November 2024
(335–108)
27 November 2024
(93–35)
31 December 2024
31-12-2024 A decree to amend and add Article 21 of the Political Constitution of the United Mexican States, regarding public security

Decreto por el que se reforma y adiciona el artículo 21 de la Constitución Política de los Estados Unidos Mexicanos, en materia de seguridad pública

21 November 2024
(441–0)
13 November 2024
(122–0)
31 December 2024
17-01-2025 A decree to add a fifth paragraph to Article 4 and a second paragraph to Article 5 of the Political Constitution of the United Mexican States, regarding health protection

Decreto por el que se adicionan un párrafo quinto al artículo 4o y un párrafo segundo al artículo 5o, de la Constitución Política de los Estados Unidos Mexicanos, en materia de protección a la salud

3 December 2024
(327–118)
11 December 2024
(86–39)
17 January 2025
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Party summary

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These tables relate to the composition of the Senate of the Republic and the Chamber of Deputies at the start of the LXVI Legislature and their current makeup, highlighting the changes in party affiliation that have occurred during the legislature.

Senate

More information Party, Start of Legislature ...
Party Start of
Legislature
Current
seats
±
National Regeneration Movement 66 67 Increase 1
National Action Party 22 21 Decrease 1
Institutional Revolutionary Party 15 14 Decrease 1
Ecologist Green Party of Mexico 13 14 Increase 1
Labor Party 6 6 Steady
Citizens' Movement 5 5 Steady
Independents / No party 1 1 Steady
Total 128 128
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Chamber of Deputies

More information Party, Start of Legislature ...
Party Start of
Legislature[15]
Current
seats
±
National Regeneration Movement 257 253 Decrease 4
National Action Party 71 71 Steady
Ecologist Green Party of Mexico 60 62 Increase 2
Labor Party 47 49 Increase 2
Institutional Revolutionary Party 36 37 Increase 1
Citizens' Movement 27 27 Steady
Independents / No party 1 1 Steady
Party of the Democratic Revolution 1 0 Decrease 1
Total 500 500
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Leadership

Presiding officers

President of the Senate

More information Session, Term ...
Session Term Portrait Name Party
1 1 September 2024

Incumbent
Thumb Gerardo Fernández Noroña[16] National Regeneration Movement
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President of the Chamber of Deputies

More information Session, Term ...
Session Term Portrait Name Party
1 1 September 2024

5 October 2024
Thumb Ifigenia Martínez y Hernández[17] National Regeneration Movement
8 October 2024[a]

Incumbent
Thumb Sergio Gutiérrez Luna[10]
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Parliamentary coordinators

More information Party, Senate ...
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Senate members

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Elected by state

In the list, the first two positions represent the senators from the winning two-name formula who secured a majority in the state. The third corresponds to the senator who earned a seat through first minority.

Elected by proportional representation

Chamber of Deputies members

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Elected by district

Elected by proportional representation

See also

Notes

  1. Served as acting president from 6–8 October 2024 and was formally elected president on 8 October.
  2. In Campeche: Before the 2024 election, Eliseo Fernández Montufar's candidacy was revoked due to an active arrest warrant.[27] Citizens' Movement's formula secured a seat through first minority, with his alternate, Daniel Barreda Pavón, becoming the senator-elect.[28]
  3. López Castro resigned her membership in the PRI on 29 October 2024[29] and joined MORENA two weeks later.[30]
  4. Saucedo Reyes was elected for the PRD as part of the Fuerza y Corazón por México coalition but switched allegiance to Morena on 28 August 2024.[3][31]
  5. Fabio Beltrones was elected as part of the Institutional Revolutionary Party (PRI), but on 12 August 2024, before the start of the legislature, the party announced his exclusion from the PRI parliamentary group due to disagreements with the party leadership.[32]
  6. In Tabasco: Rosalinda López Hernández, the senator-elect, died on 5 June 2024, before being sworn in.[33] Her alternate, Alejandra Arias Trevilla, took her place.[34]
  7. Herrera Dagdug was elected for the PRD as part of the Fuerza y Corazón por México coalition but switched allegiance to Morena on 28 August 2024.[3][31]
  8. On 10 September 2024, Yunes Márquez was granted a leave of absence on health grounds, and Miguel Ángel Yunes Linares was sworn in as his alternate.[35] Later the same day, however, Yunes Márquez returned to his seat.[36]
  9. On 23 November 2024, the National Action Party (PAN) parliamentary group expelled Yunes Márquez due to his vote in favor of the 2024 Mexican judicial reform.[37]
  10. Yunes Márquez joined Morena on 18 February 2025.[38]
  11. Was among the eight deputies who switched from Morena to the Ecologist Green Party of Mexico on 1 September 2024.[39]
  12. Following the loss of the Party of the Democratic Revolution's registration as a federal party, on 20 September 2024, Sandoval Hernández joined the Institutional Revolutionary Party.[40]
  13. Was among the three deputies who switched from the Labor Party to Morena on 19 September 2024.[41]
  14. Was among the five deputies who switched from Morena to the Labor Party on 19 September 2024.[41]
  15. Was among the six deputies who switched from the Ecologist Green Party of Mexico to Morena on 1 September 2024.[39]
  16. Aguas Atlahua was murdered in Zongolica, Veracruz, on 9 December 2024.[42] His alternate, Puertos Chimalhua, was sworn in on 11 December.[43]
  17. Héctor Melesio Cuén Ojeda had been assigned a seat through proportional representation but was murdered on 25 July 2024, before the start of the legislature.[44] His alternate, Juan Moreno de Haro, took his place.[45]
  18. On 11 December 2024, the Chamber's plenary granted Vitela Rodríguez's request to vacate her seat as of 15 January 2025.[43]

References

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