WASHINGTON (AP) — Twenty-one states are suing Delaware to give back more than $150 million in uncashed money orders.

Texas Attorney General Ken Paxton said Thursday the states are suing Delaware at the U.S. Supreme Court over an escalating dispute involving uncashed money orders from Dallas-based MoneyGram.

MoneyGram has been submitting unclaimed money to Delaware, where the company is incorporated. The other states argue that the money should go back to the state where purchased.

Abandoned property is the third-largest source of general fund revenue for Delaware and is expected to total more than half a billion dollars in the current fiscal year. The huge amount stems from Delaware's status as the legal home to more than 1 million businesses.

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La. Attorney General Jeff Landry added “Delaware wrongfully holds roughly $2 million that belong to Louisiana’s taxpayers. I will work with my colleagues to ensure this money is properly returned.”