Brazilian ex-president (2003-2011) Luiz Inacio Lula da Silva arrives at the Federal Police headquarters where he is due to serve his 12-year prison sentence, in Curitiba, Parana State, Brazil, on April 7, 2018. - Brazil's election frontrunner and controversial leftist icon said Saturday that he will comply with an arrest warrant to start a 12-year sentence for corruption. "I will comply with their warrant," he told a crowd of supporters. (Photo by Heuler Andrey / AFP) (Photo credit should read HEULER ANDREY/AFP via Getty Images)