The leading Democrats on two U.S. Senate committees are asking Social Security chief Frank Bisignano’s company about a huge contract it received to manage a debit card program serving millions of Social Security recipients.

The letter from Massachusetts Sen. Elizabeth Warren and Oregon Sen. Ron Wyden also requests information about Bisignano’s activities at Fiserv Inc., the Wisconsin firm whose stock prices tanked earlier this year after it withdrew certain economic projections it could not meet.

“Because of Mr. Bisignano’s mismanagement, many Fiserv investors, including retirees and members of the public, lost money—a fate Mr. Bisignano avoided,” the letter said. “Bisignano’s required divestment of company stock helped him avoid about $300 million in losses caused by the stock’s price

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