(Bloomberg) -- Colombian prosecutors opened an investigation into the financing of Gustavo Petro’s 2022 presidential campaign, following a scandal that has already caused two top aides to step down.

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Prosecutors will look to determine whether the campaign broke the law by accepting money from prohibited sources, or by violating spending limits, according to a statement from the Attorney General’s office.

The investigation comes after Semana magazine published leaked audios from Petro’s former campaign chief, Armando Benedetti, hinting at a breach of financing rules during the election. Both Benedetti and Petro’s cabinet chief stepped down earlier this month.

The Presidency didn’t immediately reply to a request for comment.

Read more: Leftist Colombia Leader Delivers the Paralysis Markets Want

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