Leaked recordings of conversations are causing yet more headaches for Brazil's acting President Michel Temer.

TV Globo has broadcast a recording in which Temer's new anti-corruption chief is heard giving legal advice to a powerful politician under investigation in a sprawling kickback probe involving the state oil company Petrobras.

It also shows Transparency Minister Fabiano Silveira criticizing the investigation itself, which has implicated some of Brazil's most prominent politicians and businessmen.

The conversation broadcast late Sunday occurred months before the Senate voted to impeach and suspend leftist President Dilma Rousseff, putting the government in Temer's hands.

Rousseff argues that her foes are trying to block the Petrobras probe and ousted her because she had allowed it to go forward.

Another leaked tape earlier forced the leave of Temer's planning minister.