Just before former Brazilian president Luíz Inácio Lula da Silva was formally appointed a minister, which would give him privilege, the judge who is investigating Lula in the Operation Car-Wash made public some intercepted calls of Lula.

In those calls, the ex-president was recorded insulting many institutions that are investigating him.

A recording between current president Dilma Rousseff and Lula raised suspicions that the nomination of the ex-president as minister was made just to delay the investigations on him.

Because of that, protests started again in the whole country.

In São Paulo, for example, the protests against the nomination have been ongoing since March 16. The same is happening in Brasília, the capital, and in 20 other states.

Lula, Rousseff and other ministers have denied any wrongdoing.

Related: What is the political crisis in Brazil all about?

The morning of March 17, just a few hours after the ex-president's ministerial position was formalized, his nomination was considered nulled in a preliminary decision by another federal judge. Since this is a preliminary decision, the ex-president can appeal. However, another 10 claims against his nomination were protocoled.

As a result, The IBOVESPA, which is the main index of the Brazilian stock market, increased more than 6 percent, and the Brazilian currency increased more than 2 percent towards the American dollar. Protests against Rousseff are still taking place across the country.