In 1987, he took office as a senator, and as a member of the
Constituent Assembly. Among the most diverse policies that would come to compose the current Federal Constitution, he voted in favor of protection against unfair dismissal, voting at age 16 and the expropriation of productive property. He was against the death penalty, abortion, presidentialism, and the five-year term of then-President José Sarney. He abstained on limiting external debt burdens and was absent from the vote on creating a fund to support agrarian reform and limiting the right to private property. After the enactment of the Constitution and the reestablishment of Congress, he was a fourth-alternate member of the Senate's Board of Directors, being rapporteur for CPIs and important projects, such as Provisional Measure No. 318, which established new rules for the Housing Finance System (SFH). He traveled on an official mission to Venezuela in 1990, and in 1992, he voted in favor of the removal and then for the impeachment of the mandate of then-president Fernando Collor, who faced an impeachment process. He resigns from office in December 1994, after being elected governor of
Mato Grosso do Sul again. With an administration in crisis, he had disagreements with the then governor Marcelo Miranda, which led him to join the
PSDB with his political group, remaining even after requests to reconsider from the then deputy
Ulysses Guimarães. He supported the candidate Gandi Jamil, who had his daughter Celina Jallad as his vice-president, against his historic opponent
Pedro Pedrossian. The result was the election of Pedrossian, who took office for the second time. == Second time as governor ==