BRASILIA, BRAZIL - MARCH 17:  Brazil's former president, Luiz Inacio Lula da Silva (L) walks with President Dilma Rousseff as he is sworn in as the new chief of staff in the Planalto Palace on March 17, 2016 in Brasilia, Brazil. His controversial cabinet appointment comes in the wake of a massive corruption scandal and economic recession in Brazil.  (Photo by Igo Estrela/Getty Images)