Brazilian police yesterday said that they arrested a presidential aide and two ex-governors as part of an investigation into the 2014 World Cup’s most expensive stadium, another black eye for the country’s political establishment that adds pressure on beleaguered President Michel Temer.

Tadeu Filippelli, a special adviser in Temer’s Cabinet, and former Federal District governors José Roberto Arruda and Agnelo Queiroz were arrested early yesterday.

The presidential palace did not reply to requests for comments and Reuters could not immediately reach representatives of Arruda and Queiroz. The Federal District encompasses the capital Brasilia.

Renovation of the Brasilia stadium for the 2014 World Cup cost about 1.5 billion reais ($459.38 million), prosecutors and police said in a statement, and an auditing court has said the construction included rampant overbilling.

It was the second-most expensive soccer arena in the world after the reconstruction of Wembley Stadium in London, according to the local World Cup committee’s documents on spending.

Temer has resisted growing calls for his resignation after the disclosure of a recorded conversation in which he appears to condone the payment of hush money to a jailed lawmaker in a separate corruption probe.

That investigation is related to a sprawling probe into bribery and kickbacks at state oil company Petrobras that helped topple former President Dilma Rousseff last year and has sent dozens of senior politicians and business to jail.