sentences:  In September 2016 it was announced that Pérez Rubalcaba rejoined his position as Chemistry professor at the Complutense University of Madrid and, in addition, he joined the editorial board of the Spanish newspaper "El País", of which he was part until July 2018.Amid the 2019 Madrid City Council election, on 26 December 2018 he rejected the proposal of Pedro Sánchez to be the PSOE candidate for mayor of Madrid.Rubalcaba was admitted to the Puerta de Hierro Hospital, in Majadahonda, on 8 May 2019, after suffering a severe stroke after teaching in the university.