As many as three million people have rallied in cities across Brazil calling for president Dilma Rouseff's impeachmen over alleged fiscal mismanagement and low approval ratings. <br /> <br />The country is amid an investigation into corruption at oil giant Petrobas that involves the former president as well as key figures from Rouseff's inner circle. <br /> <br />Investigators have been looking into claims that former President Lula da Silva benefited from illegal kickbacks at Petrobras when he was in power.
