The bankruptcy trustee recovering money for victims of the Ponzi scheme operated by imprisoned Minnesota businessman Tom Petters is suing BMO Harris Bank, accusing it as the owner of M&I Bank of aiding and abetting the fraud, the Associated Press reported yesterday. The lawsuit filed in bankruptcy court in yesterday accuses the formerly Milwaukee-based M&I Bank of turning a blind eye to $35 billion that flowed in and out of the main bank account that Petters Company Inc. used to finance the $3.65 billion Ponzi scheme for more than five years.