The Brazilian attorney general's office says it has asked the country's highest court to authorize corruption investigations into a prominent opposition figure and other top politicians.

Attorney General Rodrigo Janot based Monday's requests on plea bargain testimony by a prominent senator ensnared in the sprawling corruption probe centered on Brazil's state-run Petrobras oil company.

His office confirmed those targeted include opposition presidential candidate Aecio Neves, who narrowly lost the 2014 race to the now-embattled incumbent, President Dilma Rousseff.

News reports said top officials in the opposition PMDB party, including party head Sen. Romero Juca, are also objects of Janot's requests, but the attorney general's office did not confirm their identities.

Vice President Michel Temer, who is a PMDB member, is in line to assume the presidency if Rousseff is impeached.