FILE - In this Oct.13, 2015 file photo, Brazil's former President Luiz Inacio Lula da Silva, right, and current President Dilma Rousseff, attend the Central Workers Union annual convention in Sao Paulo, Brazil. The Brazilian government's leader in the lower house of Congress said Wednesday, March 16, 2016, that Silva has been named chief of staff to Rousseff. It's a move that could help Silva avoid possible detention in expanding corruption probes that have now touched the top of Brazil's political leadership. (AP Photo/Nelson Antoine, File)