He formed part of the first government after the death of Franco as Minister of Labour, a position he held from 11 December 1975 to 7 July 1946. Some authors have suggested that this appointment was partially in recognition of his previous participation in the negotiations with Morocco. However, the labour situation Solís found was very complicated. The Spanish economy had weakened significantly due to the effects of the oil crisis of 1973. During the first months of 1976, the opposition's trade union forces embarked on an important campaign of mobilizations and strikes, with a total of 17,731 strikes. In this context, the Vitoria massacre occurred, during which several workers were killed by police repression. Solís retired from his post following the end of the Arias government in July 1976. He has since abandoned political life to focus on business activity. He died at his home in Madrid on 20 May 1990 and was buried in his hometown.