Sen. Elizabeth Warren tore into Equifax on Friday for trying to push customers to give up their right to sue the credit monitoring company.

Equifax, the victim of massive hack that exposed personal information of as many as 143 million Americans, including Social Security numbers, offered help on its Web site — but by clicking on a button to seek the credit monitoring service persons automatically waived their right to sue the company over the security breach.

It was not made abundantly clear to customers that they weree waiving that right.

“.@Equifax is forcing you to give up your right to join a class action against the company if you want their credit protection product,” Warren (D-Mass.) tweeted. “That’s right: @Equifax fails to protect your data and then they demand you give up legal rights if you want to limit the damage they caused.”

The tweets come the day after the company admitted that people’s social security numbers, driver’s license numbers, addresses, credit card numbers, and other personal information was breached by hackers from May to July.

Warren has been crusading for a rule that would prevent companies from forcing customers into arbitration. That rule, which is being implemented by the Consumer Financial Protection Bureau, is under attack by the White House and consumer groups.

“It’s outrageous that @Equifax – a company whose one job is to collect consumer information – failed to safeguard data for 143M Americans,” she added.

Separately, New York Attorney General Eric T. Scheiderman started investigating Equifax over the breach, claiming that it effects 8 million New Yorkers.

“The Equifax breach has potentially exposed sensitive personal information of enarly everyone with a credit report, andmy office intends to get to the bottom of how and why this massive hack occurred,” Schneiderman said.

Representatives for Equifax weren’t immediately available for comment.