It consisted of Senators and Deputies in their respective chambers.

The composition of the LXII Legislature was as follows: Members of the Senate of the Republic are elected for a term of six years.

As a result, the PRI had to form crossparty coalitions in order to pass key reforms, particularly those requiring constitutional amendments.

[1] In the July 2012 elections the PRI gained 2 seats, ending with 52.

[1] The 128 Senators that make up the LXII Legislature are as follows: The Institutional Revolutionary Party lost 32 seats, ending with 207.