| 66th Congress (LXVI Legislatura) | |||||
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| Overview | |||||
| Legislative body | Congress of the Union | ||||
| Term | 1 September 2024 (2024-09-01) – 31 August 2027 (2027-08-31) | ||||
| Election | 2 June 2024 | ||||
| Senate | |||||
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| Members | 128 senators | ||||
| President |
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| Chamber of Deputies | |||||
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| Members | 500 deputies | ||||
| President |
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TheLXVI Legislature of the Congress of the Union (66th Congress) is the current session of the legislative branch of Mexico, composed of theChamber of Deputies and theSenate of the Republic. It convened on 1 September 2024, and will end on 31 August 2027,[1] covering the final month ofAndrés Manuel López Obrador'sterm in office and the first three years ofClaudia Sheinbaum's presidency.
Both chambers ofCongress were elected in the2024 general election. There were three competing forces:theSigamos Haciendo Historia coalition, consisting of theNational Regeneration Movement (Morena), theLabor Party (PT), and theEcologist Green Party of Mexico (PVEM); theFuerza y Corazón por México coalition, comprising theNational Action Party (PAN), theInstitutional Revolutionary Party (PRI), and theParty of the Democratic Revolution (PRD); and theCitizens' Movement (MC), the only party to run without allies.
Sigamos Haciendo Historia won asupermajority in the Chamber of Deputies, granting the ruling coalition 73% of the seats, the highest share since theLII Legislature in 1982, duringMiguel 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 ofCynthia López, elected for the PRI in Mexico City, on 12 November.[4] This marked the first time since theLIII Legislature in 1985 that the ruling coalition held a supermajority in both chambers.[5]
| 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 |
| 17-03-2025 | A decree to amend and add various provisions of Articles 4 and 27 of the Political Constitution of the United Mexican States, regarding the conservation and protection of native maize. Decreto por el que se reforman y adicionan diversas disposiciones de los artículos 4o. y 27 de la Constitución Política de los Estados Unidos Mexicanos, en materia de conservación y protección de los maíces nativos. | 25 February 2025 (382–88) | 5 March 2025 (88–18) | 17 March 2025 |
| 01-04-2025 | A decree to add a second paragraph to Article 123 of the Political Constitution of the United Mexican States, regarding support for youth Decreto por el que se adiciona un segundo párrafo al artículo 123 de la Constitución Política de los Estados Unidos Mexicanos, en materia de apoyo a jóvenes. | 25 September 2024 (473–0) | 11 March 2025 (112–0) | 1 April 2025 |
| 01-04-2025 | A decree to amend and supplement Articles 55, 59, 82, 115, 116, and 122 of the Political Constitution of the United Mexican States, regarding non-reelection and electoral nepotism Decreto por el que se reforman y adicionan los artículos 55, 59, 82, 115, 116 y 122 de la Constitución Política de los Estados Unidos Mexicanos, en materia de no reelección y nepotismo electoral. | 4 March 2025 (432–28) | 25 February 2025 (97–26) | 1 April 2025 |
| 01-04-2025 | A decree to amend the second paragraph of Article 19 and add second and third paragraphs to Article 40 of the Political Constitution of the United Mexican States, regarding the strengthening of national sovereignty Decreto por el que se reforma el segundo párrafo del artículo 19 y se adicionan los párrafos segundo y tercero al artículo 40 de la Constitución Política de los Estados Unidos Mexicanos, en materia de fortalecimiento de la soberanía nacional. | 11 March 2025 (327–116) | 26 February 2025 (100–17) | 1 April 2025 |
| 15-04-2025 | A decree to amend the tenth paragraph of Article 25 and Subsection XXIX-Y of Article 73 of the Political Constitution of the United Mexican States, regarding administrative simplification and digitalization Decreto por el que se reforman el párrafo décimo del artículo 25 y la fracción XXIX-Y del artículo 73 de la Constitución Política de los Estados Unidos Mexicanos, en materia de simplificación administrativa y digitalización. | 19 March 2025 (425–19) | 12 March 2025 (107–3) | 15 April 2025 |
| Year | Official title | Votes | Published | Total expenditures | |
|---|---|---|---|---|---|
| Deputies | Senate | ||||
| 2025 | Law of Revenues of the Federation for the Fiscal Year 2025 Ley de Ingresos de la Federación para el Ejercicio Fiscal de 2025 | 26 November 2024 (367–95) | 4 December 2024 (84–36) | 19 December 2024 | MX$9.302 trillion |
| Budget of Expenditures of the Federation for the Fiscal Year 2025 Presupuesto de Egresos de la Federación para el Ejercicio Fiscal 2025 | 11 December 2024 (349–129) | N/a | 24 December 2024 | ||
| 2026 | Law of Revenues of the Federation for the Fiscal Year 2026 Ley de Ingresos de la Federación para el Ejercicio Fiscal de 2026 | 15 October 2025 (349–128) | 29 October 2025 (80–37) | 7 November 2025 | MX$10.19 trillion |
| Budget of Expenditures of the Federation for the Fiscal Year 2026 Presupuesto de Egresos de la Federación para el Ejercicio Fiscal 2026 | 4 November 2025 (358–133) | N/a | 21 November 2025 | ||
These tables relate to the composition of theSenate of the Republic and theChamber 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.
|
| Party | Start of Legislature | Current seats | ± | |
|---|---|---|---|---|
| National Regeneration Movement | 66 | 67 |  1 | |
| National Action Party | 22 | 21 |  1 | |
| Ecologist Green Party of Mexico | 13 | 14 | 1 | |
| Institutional Revolutionary Party | 15 | 13 | 2 | |
| Labor Party | 6 | 6 |  | |
| Citizens' Movement | 5 | 6 | 1 | |
| Independents / No party | 1 | 1 | | |
| Total | 128 | 128 | ||
|
| Party | Start of Legislature[23] | Current seats | ± | |
|---|---|---|---|---|
| National Regeneration Movement | 257 | 253 | 4 | |
| National Action Party | 71 | 70 | 1 | |
| Ecologist Green Party of Mexico | 60 | 62 | 2 | |
| Labor Party | 47 | 49 | 2 | |
| Institutional Revolutionary Party | 36 | 37 | 1 | |
| Citizens' Movement | 27 | 28 | 1 | |
| Independents / No party | 1 | 1 | | |
| Party of the Democratic Revolution | 1 | 0 | 1 | |
| Total | 500 | 500 | ||
On 29 August 2024, the Senate elected the Board of Directors for the first year of the legislative period. In a secret ballot, Senator Gerardo Fernández Noroña of Morena was chosen as President of the Senate with 127 votes in favor.[24][25] On 3 September, the Political Coordination Board approved an expansion of the Board of Directors for a one-year term, adding an additional vice presidency for the PVEM.
| Post | Name | Term | Party | ||
|---|---|---|---|---|---|
| President of the Senate |  | Gerardo Fernández Noroña | 1 September 2024 – 31 August 2025 | National Regeneration Movement | |
| First Vice President |  | Imelda Castro Castro | 1 September 2024 – 31 August 2025 | National Regeneration Movement | |
| Second Vice President |  | Mauricio Vila Dosal | 1 September 2024 – 31 August 2025 | National Action Party | |
| Third Vice President | .jpg) | Karla Toledo Zamora | 1 September 2024 – 31 August 2025 | Institutional Revolutionary Party | |
| Fourth Vice President |  | Jorge Carlos Ramírez Marín | 3 September 2024 – 31 August 2025 | Ecologist Green Party of Mexico | |
On 29 August 2025, the Senate elected the Board of Directors for the second year of the legislative period. In a secret ballot, Senator Laura Itzel Castillo of Morena was chosen as President of the Senate with 101 votes in favor.[26] The election marked the first time in 96 years that the Institutional Revolutionary Party (PRI) did not hold either the presidency or a vice presidency on the Board.[27]
| Post | Name | Term | Party | ||
|---|---|---|---|---|---|
| President of the Senate |  | Laura Itzel Castillo | 1 September 2025 – Incumbent | National Regeneration Movement | |
| First Vice President |  | Verónica Camino Farjat | 1 September 2025 – Incumbent | National Regeneration Movement | |
| Second Vice President | .jpg) | Imelda Sanmiguel Sánchez | 1 September 2025 – Incumbent | National Action Party | |
| Third Vice President | | Jorge Carlos Ramírez Marín | 1 September 2025 – Incumbent | Ecologist Green Party of Mexico | |
On 29 August 2024, the Chamber of Deputies elected the Board of Directors for the first year of the legislative period. In a secret ballot, Ifigenia Martínez y Hernández (Morena) was chosen as President of the Chamber of Deputies with 496 votes in favor.[28][29]
On 5 October 2024, President Martínez y Hernández died, and First Vice President Sergio Gutiérrez Luna was elected as substitute president on 8 October 2024 to finish her term.[30] Dolores Padierna Luna was elected as First Vice President, taking Gutiérrez Luna's place. On 1 April 2025, Vice President María del Carmen Pinete Vargas died, and María Luisa Mendoza Mondragón was elected with 394 votes on 22 April 2025 to complete the term.[31]
On 31 August 2025, following Morena’s rejection of the PAN’s proposals for the presidency of the Chamber for the second legislative year, the term of the 2024–2025 Board of Directors was extended until 5 September.[18]
| Post | Name | Term | Party | ||
|---|---|---|---|---|---|
| President of the Chamber of Deputies |  | Ifigenia Martínez y Hernández | 1 September 2024 – 5 October 2024 | National Regeneration Movement | |
 | Sergio Gutiérrez Luna | 8 October 2024[a] – 2 September 2025 | National Regeneration Movement | ||
| First Vice President | | Sergio Gutiérrez Luna[32] | 1 September 2024 – 8 October 2024 | National Regeneration Movement | |
 | Dolores Padierna Luna | 8 October 2024 – 2 September 2025 | National Regeneration Movement | ||
| Second Vice President |  | Kenia López Rabadán[32] | 1 September 2024 – 2 September 2025 | National Action Party | |
| Third Vice President | .jpg) | María del Carmen Pinete Vargas[32] | 1 September 2024 – 1 April 2025 | Ecologist Green Party of Mexico | |
| María Luisa Mendoza Mondragón | 22 April 2025 – 2 September 2025 | Ecologist Green Party of Mexico | |||
| Post | Name | Term | Party | ||
|---|---|---|---|---|---|
| President of the Chamber of Deputies | | Kenia López Rabadán | 2 September 2025 – Incumbent | National Action Party | |
| First Vice President | | Sergio Gutiérrez Luna | 2 September 2025 – Incumbent | National Regeneration Movement | |
| Second Vice President | Paulina Rubio Fernández [es] | 2 September 2025 – Incumbent | National Action Party | ||
| Third Vice President | Raúl Bolaños Cacho Cué | 2 September 2025 – Incumbent | Ecologist Green Party of Mexico | ||
| Party | Senate | Chamber of Deputies | |||
|---|---|---|---|---|---|
| National Action Party | Guadalupe Murguía Gutiérrez | 2024–2025 | Noemí Luna Ayala[33] | 2024–2025 | |
| Ricardo Anaya[34] | since 2025 | Elías Lixa Abimerhi [es][35] | since 2025 | ||
| Institutional Revolutionary Party | Manuel Añorve Baños[36] | since 2024 | Rubén Moreira Valdez[37] | since 2024 | |
| Labor Party | Alberto Anaya[38] | since 2024 | Reginaldo Sandoval Flores [es][38] | since 2024 | |
| Ecologist Green Party of Mexico | Manuel Velasco Coello[39] | since 2024 | Carlos Alberto Puente Salas[39] | since 2024 | |
| Citizens' Movement | Clemente Castañeda Hoeflich[40] | since 2024 | Ivonne Ortega Pacheco[40] | since 2024 | |
| National Regeneration Movement | Adán Augusto López[41] | 2024–2026 | Ricardo Monreal[42] | since 2024 | |
| Ignacio Mier Velazco[43] | since 2026 | ||||
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.
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