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Mexico: Legislative
Country Study > Chapter 4 > Government and Politics > Government Structure > Legislative

LEGISLATIVE


The legislative branch of the Mexican government consists of a bicameral congress (Congreso de la Unión) divided into an upper chamber, or Senate (Cámara de Senadores), and a lower chamber, or Chamber of Deputies (Cámara de Diputados). As in the United States, both chambers are responsible for the discussion and approval of legislation and the ratification of high-level presidential appointments. In theory, the power of introducing bills is shared with the executive, although in practice the executive initiates about 90 percent of all legislation.

The congress holds two ordinary sessions per year. The first session begins on November 1 and continues until no later than December 31; the second session begins on April 15 and may continue until July 15. A Permanent Committee (Comisión Permanente), consisting of thirty-seven members (eighteen senators and nineteen deputies), assumes legislative responsibilities during congressional recesses. The president may call for extraordinary sessions of congress to deal with important legislation.

Historically, the Senate consisted of sixty-four members, two members for each state and two representing the Federal District elected by direct vote for six-year terms. However, as part of the electoral reforms enacted by the Salinas government in 1993, the Senate was doubled in size to 128 members, with one of each state's four seats going to whichever party comes in second in that state. Since 1986 the Chamber of Deputies has consisted of 500 members, 200 of whom are elected by proportional representation from among large plurinominal districts, and the remainder from single-member districts. Members of the Chamber of Deputies serve three-year terms. All members of the congress are barred from immediate reelection but may serve nonconsecutive terms.

The powers of the congress include the right to pass laws, impose taxes, declare war, approve the national budget, approve or reject treaties and conventions made with foreign countries, and ratify diplomatic appointments. The Senate addresses all matters concerning foreign policy, approves international agreements, and confirms presidential appointments. The Chamber of Deputies, much like the United States House of Representatives, addresses all matters pertaining to the government's budget and public expenditures. As in the United States, in cases of impeachment, the Chamber of Deputies has the power to prosecute, and the Senate acts as the jury. In some instances, both chambers share certain powers, such as establishing committees to discuss particular government issues and question government officials. The deputies have the power to appoint a provisional president. In the event of impeachment, the two chambers are convened jointly as a General Congress. Each legislative chamber has a number of committees that study and recommend bills. If there is disagreement between the chambers, a joint committee is appointed to draft a compromise version.




Last Updated: June 1996


Editor's Note: Country Studies included here were published between 1988 and 1998. The Country study for Mexico was first published in 1996. Where available, the data has been updated through 2008. The date at the bottom of each section will indicate the time period of the data. Information on some countries may no longer be up to date. See the "Research Completed" date at the beginning of each study on the Title Page or the "Data as of" date at the end of each section of text. This information is included due to its comprehensiveness and for historical purposes.

Note that current information from the CIA World Factbook, U.S. Department of State Background Notes, Australia's Department of Foreign Affairs and Trade Country Briefs, the UK's Foreign and Commonwealth Office's Country Profiles, and the World Bank can be found on Factba.se.

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