Sen. Elizabeth Warren, D-Mass., received $1.9 million from private legal work during her time as a law professor stretching back three decades, according to a release by her campaign.

The work, since 1986, included fees from large corporate clients, her campaign said in the release.

Some of her clients included the attorneys for Rabobank, a Dutch financial institution that became a creditor in the Enron bankruptcy; former directors of Getty Oil, who were involved in Texaco’s bankruptcy; and women whose allegations of harm from silicone breast implants produced by Dow Corning were imperiled when the company filed for bankruptcy.

In May, Warren released a list of 56 cases on which she worked as an attorney going back to the 1980s, as The Associated Press reported; 15 pages of newly released data showed she was paid over $1.9 million on nearly 40 of those cases in total.

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The release Sunday came against the backdrop of an escalating feud between Warren and Mayor Pete Buttigieg of South Bend, Indiana. The senator has condemned the closed-door fundraisers that the mayor has attended, suggesting Buttigieg could be making secret promises to top donors.

Buttigieg and his campaign responded that Warren should release past tax returns that detail her work for corporate clients. Warren previously had released 11 years of tax returns.

“We must nominate a candidate who can create the most robust possible contrast against Republicans on conflicts of interest and corruption issues. … Elizabeth does not sell access to her time -- no closed door big dollar fundraisers, no bundling program, no perks or promises to any wealthy donor,” said Warren Communications Director Kristen Orthman.

She added: “Any candidate who refuses to provide basic details about his or her own record and refuses to allow voters or the press to understand who is buying access to their time and what they are getting in return will be seen by voters as part of the same business-as-usual politics that voters have consistently rejected.”

Warren’s campaign said Sunday’s information provides more details on her business income that her returns did not provide because they didn’t fully itemize earnings.

Also Sunday, Warren said she believed Americans would be ready for a presidential ticket with two women at the top, rejecting concerns from some Democrats that a woman couldn’t beat Trump.

“Sure, why not?” she told The Associated Press in an interview ahead of a town hall campaign event in Charleston, South Carolina. “I think (voters) would support a lot of different combinations.”

Warren has said she’d consider picking California Sen. Kamala Harris as a running mate. She also told the AP she would be “open” to asking former Vice President Joe Biden to reprise his old job.

“Look, it would be presumptuous of me to be talking about individuals, but I’m open to getting this right because that’s what we want to do,” Warren said. “We want to build a Democratic ticket and a stronger Democratic Party that’s ready to get out there and compete at the national level, at the state level, at the local level.”

Last week, Harris abruptly dropped out of the race for the presidential nomination, prompting a debate about whether a party claiming it valued diversity and inclusion was shortchanging candidates of color and women.

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Other than Warren, the top tier of Democrats has been made up entirely of white men.

Warren argued that voters were worried less about identity politics than the messages that candidates were offering.

Fox News’ Tara Prindiville and The Associated Press contributed to this report.