JPMorgan Chase & Co. says its has the right to hang on to billions of dollars worth of securities, potential tax refunds, cash and other assets that have been claimed by the former parent of Washington Mutual Bank, the seized thrift JPMorgan bought for $1.9 billion.

JPMorgan staked its claim Tuesday in a Delaware bankruptcy court lawsuit aimed at Wamu's former parent, Washington Mutual Inc., and at the Federal Deposit Insurance Corp. JPMorgan's suit follows by days the filing of a lawsuit by Wamu's former parent against the FDIC, seeking billions in damages.

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