Sen. Elizabeth Warren and Rep. Alexandria Ocasio-Cortez teamed up Thursday to blast Treasury Secretary Steven Mnuchin over the bankruptcy of Sears.

The Democrats from Massachusetts and New York, respectively, are questioning Mnuchin’s actions as a member of the Sears board and his longstanding ties to Eddie Lampert, the Sears CEO who came into that role after the retailer was purchased by his hedge fund.

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Lampert and Mnuchin were, in fact, college roommates.

“We are deeply concerned by the financial engineering and potentially illegal activity that took place at Sears Holding Corporation while you served on the company’s board. In addition, we are concerned that, as Treasury Secretary, you are in position to take actions that benefit Sears’ shareholders and owners at the expense of workers and taxpayers,” the lawmakers wrote in a letter released Thursday.