The former CEO of Equifax returned to Capitol Hill on Wednesday, this time facing tough questioning from members of the Senate Banking Committee about the massive data breach the company disclosed last month.

Sen. Elizabeth Warren of Massachusetts peppered Richard Smith with questions about the company's business, which benefits when consumers buy credit protection and monitoring services, something that tends to happen when they fear their personal information has been compromised.

"This breach has created more business opportunities," she said, after quoting Smith from a recent speech in which he said fraud was a huge opportunity for the company.

"Equifax didn't have a reason to care" about protecting the data, she said.

In the hearing, Smith said "one of the greatest risks we face every day is cybersecurity."

The data breach compromised personal identifying information for more than 145 million people. Smith's prepared remarks were similar to those written for his appearance before the House Energy and Commerce Committee on Tuesday, where he claimed "full responsibility."