A report by the Globe Spotlight Team and the Washington-based Center for Responsive Politics on Sunday found that the firm gave its attorneys hundreds of bonuses that matched their political donations, a legally dubious practice that prompted calls for state and federal investigations.

So far, at least 13 politicians from around the country, including eight candidates for US Senate, Massachusetts Attorney General Maura Healey, and state Treasurer Deb Goldberg, have said they will return more than $250,000 in total donations from Thornton, a major fund-raiser for the Democratic party nationally.

Boston Mayor Martin J. Walsh and Hillary Clinton on Monday joined a growing number of politicians vowing to return thousands of dollars in donations from the Thornton Law Firm after a pattern of questionable campaign contributions. Meanwhile, US Senator Elizabeth Warren promised to give her donations back if investigators find they’re illegal.


A Clinton campaign official said she would return the donations she’s received to the US Treasury rather than giving the money back to the law firm. The official didn’t say how much, but Center for Responsive Politics records show that Clinton has received at least $20,000 from lawyers at Thornton and their spouses during her presidential campaign.

Walsh said his campaign staff is reviewing the tens of thousands of dollars in donations his campaigns have received from Thornton lawyers over the years, but will immediately return more than $15,000 received this year. He said his campaign is following directions from the state Office of Campaign and Political Finance.

“We’re reviewing everything,” said Walsh in an interview.

The law firm, in a statement issued late on Monday, defended its contribution practices.

“The Thornton law firm has done nothing wrong and it consulted with an outside law firm and accountant 10 years ago when its political donation program — involving the personal funds of equity partners only — was implemented,” said Thornton Law Firm’s attorney, Brian Kelly. “While we see no need to do so, if individual politicians want to return donations, that certainly is up to them.”


Governor Charlie Baker, along with the Republican Party and a conservative think tank, called on federal and state campaign finance watchdogs to investigate more than $1 million in campaign contributions from the firm’s lawyers.

“I certainly hope this issue gets investigated,” said Baker. “I think this particular story in the Globe raises a number of serious issues, and I hope that the parties that are involved in regulating campaign finance at the state and federal level take a look at it.”

The Massachusetts Fiscal Alliance, the think tank, wrote to the state’s Office of Campaign and Political Finance, requesting that it investigate more than $250,000 in donations Thornton lawyers wrote to state and local candidates. If regulators open an investigation, it would be the biggest campaign finance inquiry in state history, records show.

The Globe’s Spotlight Team and the Center for Responsive Politics, a nonprofit that analyzes campaign spending, reported Sunday that three partners of Thornton Law Firm and one of the partner’s wives donated nearly $1.6 million to Democratic Party fund-raising committees and politicians from 2010 through 2014.

Michael Thornton’s law firm is facing scrutiny after it paid “bonuses” to partners who made campaign donations to the Democratic Party. Brian McCarthy/Corporate Close Ups Michael Thornton’s law firm is facing scrutiny after it paid “bonuses” to partners who made campaign donations to the Democratic Party.

During the same period, the partners received $1.4 million in “bonuses,” according to the report. More than 280 of the contributions matched bonuses that were paid within 10 days.


Experts told the Globe the reimbursement program could violate federal and state laws, because repaying donors for their donations can conceal the source of donations and enable the actual source of the money to exceed contribution limits. They could also violate Massachusetts law, which prohibits donations by corporations or partnerships.

Federal law allows partnerships to give, but only as much as an individual may contribute; this year, that’s $2,700 per candidate.

Thornton has said the program complied with applicable laws. Lawyers for the firm said the reimbursements were legal because they came out of the partners’ own money.

On Sunday, New Hampshire Governor Maggie Hassan said she would return $51,000 in campaign donations she received from the law firm, the Globe reported. Hassan is the Democratic candidate for US Senate in this year’s election.

Since then, other Democratic Senate candidates said they, too, would return Thornton money, including Russell Feingold of Wisconsin; Catherine Cortez-Masto of Nevada; Katie McGinty of Pennsylvania, Ted Strickland of Ohio, Patrick Murphy of Florida, Jason Kander of Missouri, and Tammy Duckworth of Illinois. Duckworth’s staff said she attended a 2015 breakfast fund-raiser at the firm’s Boston offices.

Goldberg, the state treasurer, said she will give back the money she received from lawyers at the firm — $9,500, according to state records.

And one state legislative candidate, Democrat Joan Meschino of Hull, said she is returning $5,750 from Thornton. She is running for the seat vacated in July by Garrett Bradley, a partner at Thornton.


But Elizabeth Warren, a top recipient of Thornton Law Firm largesse, said she was not ready to return Thornton donations yet. The Center for Responsive Politics found that her campaign, combined with her PAC, have received $129,520 from Thornton lawyers since 2007.

Warren’s office said she thinks the matter should be reviewed by legal authorities and if it is determined the donations were impermissible, she will give the money back.

A spokesman for US Representative Joseph Kennedy said the Democrat is “troubled” by the allegations against Thornton. “His campaign is currently reviewing all Thornton Law Firm donations,” according to a statement from his office.

Kirsten Hughes, chairwoman of the Massachusetts Republican Party, said the donations raise serious questions about Democratic fund-raising.

“It’s troubling to see that so many Massachusetts Democrats have taken donations from a firm that ran a potentially illegal fund-raising scheme designed to circumvent campaign finance rules,” she said in a statement. “Regulators at OCPF and the FEC must immediately investigate this Democrat fund-raising scheme and the candidates who participated in it, to ensure the integrity of our campaign finance system.”

Jay Cincotti, executive director of the state’s Democratic Party, one of the largest recipients of donations from the firm, said it is “reviewing the contributions with our legal counsel and compliance team. We take campaign finance issues very seriously.”

Cincotti then called the Republican party hypocritical for “pointing fingers while, at the same time, helping Charlie Baker run a laundering scheme that not only promises access to the governor, but that funnels tens of thousands of dollars from the RNC into Baker’s campaign coffers.”


Cincotti was referring to a 2015 Globe story that said Baker had used the state GOP’s federally raised donations to rebuild his campaign account, despite a state law banning the use of federal funds for state political activities.

The Fiscal Alliance urged state regulators to pay particular attention to the actions of one partner, Bradley, who was House assistant majority leader until he resigned in July as the Globe began asking questions about Thornton’s business practices. Alliance officials said regulators should look at his role in providing donations and his actions as a lawmaker.

“Such contributions by Bradley and his associates must be returned as part of restitution, as the monies constitute an unfair advantage,’’ said Paul Craney, the group’s executive director, in a statement.

Josh Miller of the Globe staff contributed to this report. Andrea Estes can be reached at andrea.estes@globe.com. John R. Ellement can be reached at ellement@globe.com. Follow him on Twitter @JREbosglobe. Viveca Novak is editorial director of the Center for Responsive Politics, a Wash-ington nonprofit that tracks money in politics. She can be reached atvnovak@crp.org. Follow her on Twitter @vjn.