TCF Financial, one of the largest issuers of debit cards in the nation, has filed a lawsuit against the Federal Reserve, challenging measures in the Dodd-Frank Act. The regional bank is trying to halt the implementation of rules and restrictions on debit-card transactions. Sen. Dick Durbin responded to the lawsuit by trying to clarify what the measure entails. "The law in no way addresses the fees TCF, or any other bank, can charge and it does not set interchange rates. Our language simply ensures that debit interchange fees charged to retailers by the card networks -- not the banks -- are 'reasonable and proportional' to the cost of processing transactions and provides competition in an area of the market where there's none," Mr. Durbin said in a statement.