Former Democratic National Committee (DNC) interim Chairwoman Donna Brazile writes in a new book that it “broke [her] heart” when she discovered evidence that she said showed Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE’s campaign fixed the Democratic nomination system in her favor.

In an excerpt from “Hacks: The Inside Story of the Break-ins and Breakdowns that Put Donald Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE in the White House" that was provided to Politico, Brazile explains how she was tasked with investigating the DNC after hacked emails suggested the Clinton campaign fixed the nomination.

“By September 7, the day I called Bernie, I had found my proof and it broke my heart,” Brazile wrote, referring to Clinton's main opponent, Sen. Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE (I-Vt.).

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Brazile described an agreement between the Clinton campaign, the DNC and Clinton’s joint fundraising committee that said the campaign would “control the party’s finances, strategy, and all the money raised.” The arrangement was made to financially help the party, which was in significant debt following the 2012 reelection campaign of former President Barack Obama Barack Hussein ObamaObama calls on Senate not to fill Ginsburg's vacancy until after election Senate Republicans face tough decision on replacing Ginsburg Cruz: Trump should nominate a Supreme Court justice next week MORE, she added.

“The campaign had the DNC on life support, giving it money every month to meet its basic expenses, while the campaign was using the party as a fund-raising clearing house,” Brazile wrote.

Brazile noted that the agreement was signed in August of 2015, effectively giving Clinton control of the party almost one year before she secured the nomination.

“The funding arrangement ... was not illegal, but it sure looked unethical,” Brazile wrote.

“If the fight had been fair, one campaign would not have control of the party before the voters had decided which one they wanted to lead. This was not a criminal act, but as I saw it, it compromised the party’s integrity.”

Brazile's revelations add to criticism from supporters of Sanders, who ran an unsuccessful insurgent campaign against Clinton in the Democratic primary.

Brazil also criticized Rep. Debbie Wasserman Schultz (D-Fla.), who helmed the DNC as chairwoman before Brazile assumed the role of interim chair, as "not a very good manager" who was not "very interested in controlling the party."

“The party chair usually shrinks the staff between presidential election campaigns, but Debbie had chosen not to do that. She had stuck lots of consultants on the DNC payroll, and Obama’s consultants were being financed by the DNC, too,” Brazile wrote

--This report was updated at 12:09 p.m.