Bernie Sanders’ former presidential campaign manager Jeff Weaver expressed shock and anger at the extent to which Hillary Clinton’s campaign apparently “owned” the Democratic National Committee.

That revelation was made in a new book from former DNC Chair Donna Brazile, who said Clinton’s campaign took complete control of the DNC when it still wasn’t clear Clinton would be the 2016 presidential nominee.

In excerpts released to Politico Thursday, Brazile writes in her new book, “Hacks: The Inside Story of the Break-ins and Breakdowns that Put Donald Trump in the White House,” that it “broke [her] heart” upon discovering evidence that she said showed the Clinton campaign “rigged” the Democratic nomination system. She went on to call Clinton’s actions “unethical,” writing that it amounted to “corruption” in her mind when she discovered it.

Sanders supporters complained that the DNC was in the bag for Clinton all along, a suspicion that Brazile confirmed on Thursday.

“It was obviously a shocking revelation,” said Weaver on CNN Friday. “It was pretty clear that they were on the Clinton side … I don’t think any of us imagined that there was actually a formal arrangement giving the Clinton campaign control of the DNC.” He went on to recall a pattern of election mishaps that were orchestrated by the DNC to squelch Sanders’ efforts to win the nomination.

Like Brazile, Weaver stopped short of accusing Clinton of committing a crime, but he described her actions as “egregious and undemocratic,” adding, “We cannot allow this to happen again.”

With that said, Weaver made it clear that “the elites still control much of the Democratic Party apparatus.” Speaking directly to the Democratic “elites,” he warned that with their shady behavior, they “are destroying the opportunity we have to take on Donald Trump” in 2020.

Weaver said he has talked to Sanders about it, but said in terms of next steps, Sanders’ team would continue to work with members of Clinton’s team and others to reform the DNC in time for the 2020 election. It’s all about “party unity,” he explained.