The Senate of Mexico is the upper house of the Congress of the Union, which is the legislative branch of the country. It consists of 128 senators, with each of the 32 states electing four senators. Senators serve for six-year terms and can be re-elected. The primary responsibilities of the Senate include approving laws, ratifying treaties, and overseeing the actions of the executive branch. Additionally, the Senate has the power to confirm appointments made by the President of Mexico, such as ambassadors and judges, ensuring a system of checks and balances within the government.