Sen. Heidi Heitkamp Mary (Heidi) Kathryn HeitkampCentrists, progressives rally around Harris pick for VP 70 former senators propose bipartisan caucus for incumbents Susan Collins set to play pivotal role in impeachment drama MORE (D-N.D.) is calling for a criminal investigation into Equifax's stock sales after a massive data breach earlier this year, Reuters reported Tuesday.

Equifax, one of the country's three major credit bureaus, revealed this month that it had learned in July that a data breach may have compromised the personal information of 143 million Americans.

Three Equifax executives, including the company's chief financial officer, John Gamble Jr., reportedly sold nearly $2 million worth of shares after learning of the data breach but before they made the hack public.

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"If that happened, somebody needs to go to jail,” Heitkamp said at the National Association of Federally-Insured Credit Unions' conference in Washington Tuesday, according to Reuters.

“It’s a problem when people can act with impunity with no consequences," she added. "How is that not insider trading?”

The top Republican and Democrat on the Senate Finance Committee sent a letter to Equifax chairman and CEO Richard Smith on Monday seeking answers on the data breach.

The FBI is also investigating the hack.