Congress of the United Mexican States

Congress of the United Mexican States
Name	Congress of the Mexican Union
Native name	Congreso de la Unión
Legislature	LXV Legislature
House type	Bicameral
Established	1824
Leaders	President of the Senate; President of the Chamber of Deputies
Members	628 (128 Senators; 500 Deputies)
Meeting place	Legislative Palace of San Lázaro, San Lázaro, Mexico City

Congress of the Mexican Union The Congress of the Mexican Union is the bicameral federal legislature of Mexico, composed of the Senate and the Chamber of Deputies. Established under the 1917 Constitution and tracing origins to the 1824 Constitution, the body meets at the Legislative Palace of San Lázaro in Mexico City. The Congress interacts with institutions such as the Federal Executive Cabinet, the Supreme Court of Justice of the Nation, and state congresses including the Congress of Jalisco and Congress of Nuevo León.

History

Congressional origins date to the Constituent Congress of 1824 and debates influenced by the Spanish Cortes of Cádiz, the Mexican War of Independence, and the First Mexican Empire. During the Pastry War, political disputes involved early congressional delegations and the Santa Anna era reshaped representation before the Reform War and the Maximilian interlude. The Restored Republic and the Porfiriato affected legislative autonomy until the revolutionary period produced the Constitution of 1917, inspired by the Mexican Revolution and leaders such as Venustiano Carranza and Álvaro Obregón. Twentieth‑century congresses were dominated by the Institutional Revolutionary Party until electoral reforms in the 1990s and the rise of parties including the PAN, the PRD, and the MORENA altered the balance. Recent historical milestones include the 1996 electoral law reforms, the 2000 legislative shifts following the 2000 Mexican general election, and the constitutional amendments of 2014 concerning the Federal Judicial Council and energy sector reforms linked to debates on Petróleos Mexicanos and the Federal Electricity Commission.

Structure and Composition

The upper chamber, the Senate, has 128 members representing 32 federal entities with seats allocated via plurality and proportional lists; the lower chamber, the Chamber of Deputies, has 500 members elected through mixed-member majoritarian systems. Leadership posts include the Presidents of each chamber and the parliamentary coordinators of party groups such as the Grupo Parlamentario de Morena, the Grupo Parlamentario del PAN, the Grupo Parlamentario PRI, and the Grupo Parlamentario del PRD. Committees and commissions echo administrative models from bodies like the Permanent Commission (Mexico), and standing committees such as the Budget and Public Accounts Committee and the Foreign Relations Committee oversee specialized domains. Legislative staff often coordinate with agencies like the Federal Electoral Institute (predecessor to the National Electoral Institute), the Auditoría Superior de la Federación, and civil society actors including Mexican Bar Association-style organizations, indigenous councils recognized under the Convention 169 of the ILO discussions in international fora.

Powers and Functions

Constitutional powers derive from articles of the 1917 Constitution and include budget approval via the Chamber of Deputies, ratification of international treaties in the Senate, issuance of legislative decrees, and oversight through mechanisms such as the Public Account review by the Auditoría Superior de la Federación. The Senate confirms diplomatic appointments including ambassadors to states like the United States and multilateral posts such as the United Nations Permanent Representative of Mexico; the Chamber initiates revenue laws and approves the federal budget sent by the President of Mexico. Congress can declare political responsibility, impeach officials via procedures connected to the Supreme Court of Justice of the Nation and the Federal Electoral Tribunal, and enact constitutional amendments ratified by state congresses such as the Congress of Oaxaca.

Legislative Process

Bills may be introduced by deputies, senators, and the President of Mexico, and by state legislatures and citizens through initiatives inspired by participatory mechanisms given in constitutional text. Committee review, floor debates, and voting thresholds follow procedures codified in internal regulations like the Internal Regulations of the Chamber of Deputies and the Internal Regulations of the Senate. Bicameral concurrence is required for ordinary laws, while constitutional amendments need supermajorities and ratification by most state congresses; budgetary bills originate in the Chamber of Deputies. Urgent legislative procedures, suspended sessions during crises such as the COVID-19 pandemic in Mexico, and extraordinary sessions convened by the President or the Permanent Commission reflect adaptive precedents from episodes including the Zapatista uprising and security legislation debates tied to the National Guard (Mexico).

Political Groups and Leadership

Major parliamentary groups include MORENA, the PRI, the PAN, the PRD, and coalitions like the Va por México alliance; smaller groups and independents also hold seats. Leadership roles encompass the Presidents of each chamber, parliamentary coordinators, committee chairs, and the members of the Board of Directors of the Chamber of Deputies, often negotiated among factions during congressional agreements similar to past accords such as the Pact for Mexico. Prominent figures across recent legislatures include senators and deputies who have served in cabinets under presidents like Felipe Calderón, Enrique Peña Nieto, and Andrés Manuel López Obrador, and lawmakers who later held posts in institutions such as the Bank of Mexico and the Federal Electoral Institute.

Elections and Terms

Deputies serve three‑year terms with reelection allowed for up to four consecutive terms under reforms enacted in 2014; senators serve six‑year terms with reelection for up to two consecutive terms. Elections occur during general elections such as the 2018 Mexican general election and the 2024 Mexican general election, administered by the National Electoral Institute (INE), with proportional representation lists and single‑member districts defined by districting authorities. Campaign finance and electoral oversight involve institutions like the Electoral Tribunal of the Federal Judiciary and regulations that emerged after controversies such as the contested 1988 Mexican general election.

Relations with Other Branches

Congress interacts constitutionally with the Executive Power of the Federation through budgetary approval, oversight, and treaty ratification, and with the judiciary via confirmation processes and impeachment referrals to the Supreme Court of Justice of the Nation. Federalism links Congress to state legislatures like the Congress of Chiapas and municipal governments, while international matters bring congressional committees into contact with delegations to the Organization of American States and the United Nations General Assembly. Interbranch tensions have arisen during conflicts over energy reform with entities such as Petróleos Mexicanos and security policies involving the Secretariat of National Defense (Mexico) and the Secretariat of the Navy (Mexico), prompting legal challenges adjudicated by the Supreme Court of Justice of the Nation and political negotiations in venues like the National Palace (Mexico City).

Category:Politics of Mexico