Democrats are scrambling to return money linked to a Boston law firm at the center of a political donation scandal.

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A handful of high-profile Democratic senators and Senate candidates have received tens of thousands of dollars from the personal injury firm Thornton Law Firm — donations that stemmed from illegal reimbursements, according to a new report from The Boston Globe and the Center for Responsive Politics.

New Hampshire Gov. Maggie Hassan, former Wisconsin Sen. Russ Feingold, Pennsylvania Senate hopeful Katie McGinty, former Nevada Attorney General Catherine Cortez Masto and Florida Rep. Patrick Murphy have all donated the campaign cash to the U.S. Treasury, a common method to “disgorge” tainted money from a campaign, according to local media reports and statements from their campaigns.

Those Democrats are vying for swing-state seats in many of 2016’s most-watched Senate races.

Members of the firm donated $45,000 to Feingold, $31,000 to Hassan, $25,000 to McGinty, $23,000 to Masto and $21,800 to Murphy.

The report discovered that the law firm paid their partners bonuses that almost directly matched the political contributions they made. For example, the same day that three partners donated $2,000 to Senate Democratic Leader Harry Reid Harry Mason ReidThe Supreme Court vacancy — yet another congressional food fight Trump seeks to turn around campaign with Supreme Court fight On The Trail: Battle over Ginsburg replacement threatens to break Senate MORE (Nev.), the firm gave the three partners bonuses for the same amount.

Since federal election law limits how much an individual can donate to a candidate, it’s illegal to secretly give through another individual, called a “straw donor.” It’s also against Massachusetts state law for corporations to make political donations, according to the report.

Now-tainted Thornton Law Firm dollars were also directed to many other Democratic candidates and causes — the Democratic Senatorial Campaign Committee received $1.5 million, the Democratic National Committee received $333,000 and Democratic super PAC American Bridge 21st Century received $250,000, according to the Globe investigation.

Massachusetts Sen. Elizabeth Warren Elizabeth WarrenHarris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda Judd Gregg: The Kamala threat — the Californiaization of America GOP set to release controversial Biden report MORE and her political action committee received $130,000, and future Senate Democratic Leader Charles Schumer Chuck SchumerSenate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' Jacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee MORE (N.Y.) received $100,000, while President Obama also received $100,000 for his presidential bid.

Sen. Lindsey Graham Lindsey Olin GrahamSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (S.C.) is the only Republican to break into the top echelon of campaign contributions — he received $62,800.

None of those lawmakers immediately returned requests for comments as to whether they would part with the money, too.

— Jordain Carney contributed.