The former PM stands accused of employing his wife for years without bothering to mention it to voters.
Things keep getting worse for South America's most populous nation and biggest economy. What is going on, Brazil?
Voters are fed up with political scandals consuming time and energy, especially when the country is facing several social and economic challenges.
After weeks of mass demonstrations and a growing threat of impeachment, President Park Geun-Hye has said she is willing to resign before her term ends in February 2018.