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BRASILIA, BRAZIL - MARCH 17: Brazil's former president, Luiz Inacio Lula da Silva, is sworn in as the new chief of staff for embattled President Dilma Rousseff 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)

BRASILIA, BRAZIL - MARCH 17:  Brazil's former president, Luiz Inacio Lula da Silva, is sworn in as the new chief of staff for embattled President Dilma Rousseff 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)