Workers' Party (Brazil) the centre-right opposition bloc as it shrank from 133 to 111 deputies. The left-wing opposition, formed by PSOL, retained control of three seats. The party was also expected to elect its presidential candidate Dilma Rousseff in the first round. However, she was not able to receive the necessary amount of valid votes (over 50%) and a second round in which she scored 56% of the votes took place on 31 October 2010. On 1 January 2011, she was inaugurated and thus became the first female head of government ever in the history of Brazil and the first "de facto" female
Impeachment of Dilma Rousseff Brazilian national petroleum company, Petrobras, on account of allegations uncovered by the Operation Car Wash investigation, and for failing to distance herself from the suspects in that investigation. Rousseff was president of the Petrobras board of directors during the period covered by the investigation, and approved Petrobras' controversial acquisition of the Pasadena Refining System. However, the Petrobras charges were not included in the impeachment because Prosecutor-General Rodrigo Janot successfully argued that a sitting president could not be investigated while in office for crimes committed prior to election. Rousseff was formally impeached on 17 April 2016. On 12 May, the Senate