Brasilia, May 3 (RHC)-- Brazil's top prosecutor asked the Supreme Court on Monday to open an investigation into opposition Senator Aecio Neves as a vast corruption probe involves more politicians.

Neves, president of the Brazilian Social Democracy Party (PSDB) and a supporter of the impeachment process against Brazilian President Dilma Rousseff, was previously included on a list of some 50 politicians thought to have taken bribes originating from state-run companies.

Brazil's Prosecutor-General Rodrigo Janot had stopped the investigation of Neves last year but is now asking to reopen it based on plea bargain testimony from another senator,  Delcidio do Amaral.  Janot has also requested an investigation of congressman Marco Maia of the ruling Workers' Party and of a judge with Brazil's federal accountability court, itself charged with rooting out corruption.

The Brazilian president is waiting for the Senate to vote on whether to open a trial for her impeachment this month after the lower house voted to take the process to the next stage.