In the 1990s, Aguirre continued his securities practice and his electoral campaigns. In 1990, Aguirre allied with the Chicano Movement to file a successful federal voting rights lawsuit to overturn San Diego’s redistricting. In 1993, Aguirre successfully defended the United Farm Workers Union in Yuma, Arizona, in a case with lettuce grower Bruce Church. Aguirre took over the defense of the case after UFW President Cesar Chavez died following two days of testimony. Aguirre finished the jury trial, which the UFW lost, but he succeeded in getting the case overturned on appeal.