Brazilian newspaper Valor Economico was first to report that Castello Branco was pushing for their exit. The people, who asked for anonymity due to the sensitivity of the matter, said that if the board members do not agree to resign, the government can call for a shareholders' meeting to elect new board members. One of the sources said the pressure for the directors' resignation is viewed within Petrobras as a threat to corporate governance rules approved as the company sought to shield the company from undue political influence. Such influence was found to be a big factor in the kickbacks and graft uncovered at Petrobras in Brazil's largest ever corruption probe. A second source said both board members were frequently at odds with Castello Branco's enemies when he worked at the company in 2015 and 2016.