The legal team representing former Nissan Motor Co. Chairman Carlos Ghosn criticized prosecutors in court filings revealed Thursday, alleging that they had engaged in "multiple acts of illegal prosecutorial misconduct" and demanding they drop charges altogether.

The defense team accused prosecutors of colluding with Nissan and officials from the Ministry of Trade, Economy and Industry to oust Ghosn and prevent further integration between Nissan and Renault SA, one of its alliance partners.

According to the filings, this was done through a secret task force with the objective of preserving the Japanese automaker's independence.