Brazil's chief prosecutor asked the Supreme Court to authorize the arrest of the presidents of the Senate and of the ruling Brazilian Democratic Movement Party, or PMDB, for allegedly trying to obstruct police investigations, newspaper O Globo said on Tuesday.
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Supreme Court Justice Teori Zavascki must now decide whether to accept the request, O Globo said.
Chief prosecutor Rodrigo Janot also requested permission to arrest suspended House speaker Eduardo Cunha and former president Jose Sarney.
Senate President Renan Calheiros, PMDB acting president and Senator Romero Juca, former president Sarney and Cunha, all plotted to oust former President Rousseff as a way to put a stop to the corruption investigations targeting them, known as Operation Car Wash.
If Calheiros is removed from the senate presidency, Senator Jorge Viana would become the acting president of the Senate in the middle of her impeachment trial in the upper house.
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The trial is expected to conclude in mid-August as Brazil is hosting the Olympic Games in Rio de Janeiro.
Under Brazilian law, the Supreme Court must approve any judicial action taken against members of congress. Sarney was included in the request, even though he is no longer a senator, because he is mentioned in the same case as Juca and Calheiros.
The chief prosecutor's request to the Supreme Court came following the release of recordings made by Sergio Machado, a former senator and PMDB ally, who struck a plea bargain deal with prosecutors to collaborate in the sweeping corruption probe that has plunged Brazil into political mayhem.
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Machado recorded Calheiros, Juca and Sarney, separately, allegedly discussing strategies to weaken the investigation.
The recordings were leaked by newspapers in recent weeks and caused Juca's dismissal as Planning Minister.
The Supreme Court voted unanimously last month to remove Cunha, a bitter rival of Rousseff's, as speaker of the lower house on charges of obstructing the corruption investigation.
Media representatives for Calheiros, Sarney, Cunha and Janot did not immediately respond to requests for comment on the O Globo report, while Juca called the move "absurd." A Supreme Court spokeswoman declined to comment.