President Carlos Menem sought a constitutional amendment to allow his re-election, and Alfonsín opposed it. The victory in the 1993 midterm elections strengthened the PJ, which approved the bill in the Senate. Menem proposed a referendum on the amendment, to force the radical deputies to support it. He also proposed a bill for a law that would allow a constitutional amendment with a simple majority of the Congress. As a result, Alfonsín made the Pact of Olivos with him. With this agreement, the UCR would support Menem's proposal, but with further amendments that would reduce presidential power. The Council of Magistracy of the Nation reduced the influence of the executive power over the judiciary, the city of Buenos Aires would become an autonomous territory allowed to elect its own mayor, and the presidential term of office would be reduced to four years. The presidential elections would include the two-round system, and the electoral college would be abolished. Alfonsín was elected to the constituent assembly that worked for the 1994 amendment of the Argentine Constitution. A faction of the UCR, led by Fernando de la Rúa, opposed the pact, but the party as a whole supported Alfonsín. The UCR got only 19% of the vote in the elections, attaining third position in the 1995 presidential elections behind the Frepaso, when Menem was re-elected. Alfonsín resigned the presidency of the party in that year.