 At the same time he was in participated of the 1964 election that was won by his uncle.After the 1973 Chilean coup d'état, he retired from politics and dedicated himself to private practice, and also to running the "Irene Frei Montalva" foundation, which provided free daycare for children of poor families.In 1969, he was elected deputy for Concepción, being reelected in 1973, with one of the highest majorities at the national level.