Hillary Clinton’s campaign abruptly canceled planned joint events on Monday with Vermont Sen. Bernie Sanders following a rocky weekend for the already tenuous alliance.

Instead of campaigning with Clinton Monday, Sanders will be deployed to Iowa and Wisconsin on Wednesday to stump solo for the Democratic nominee. Although the exact reason for the cancellation is unclear, the schedule changes come as Clinton faces backlash for an audio recording taken in February and leaked last week, in which she disparaged Sanders and his legions of millennial supporters.

“The awkward indignities of a populist from Vermont defending a corrupt insider from Washington, D.C., were on full display this morning”.

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“Wednesday’s Des Moines stop was added to make up for appearances tentatively scheduled in Iowa on Monday, Oct. 3,” Clinton’s campaign said in a statement, adding that Sanders will be promoting Clinton’s “plan to build an economy that works for everyone, not just those at the top” and condemning “Donald Trump’s plan, which would benefit himself and other millionaires and billionaires.”

In the leaked audio recording from a fundraiser in February, Clinton can be heard offering her thoughts on Sanders’ flock of young voters and suggesting they’re looking for false promises of free things.

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“Some are new to politics completely. They’re children of the Great Recession. And they are living in their parents’ basement,” Clinton said, adding that Sanders’ supporters held a “deep desire to believe that we can have free college, free health care, that what we’ve done hasn’t gone far enough, and that we just need to, you know, go as far as, you know, Scandinavia, whatever that means — and half the people don’t know what that means, but it’s something that they deeply feel.”

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Clinton also accused Sanders of selling a “false promise” to his supporters throughout his campaign.

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Although Sanders admitted that some of Clinton’s statements were correct and that many of his supporters “are living in their parents’ basements,” the leaked audio may have deepened the rift between the former rivals that they experienced during the primary season.

“Well, I agree with her, what she is saying,” Sanders told CNN’s “State of the Union” host Jake Tapper Sunday. “There are young people who went deeply into debt, worked very hard to get a good education, and yet get out of school and can’t get decent jobs … and are living in their parents’ basements. There is a point there.”

But when Tapper asked Sanders if Clinton’s words from months ago bothered him, the Vermont senator admitted that they did and drew attention to the “differences” he maintains with Clinton.

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“Of course it does, but we are in the middle of a campaign … If you go to some of the statements I made about Hillary Clinton, we have real differences,” Sanders told Tapper.

The off-message line from Sanders may have played a role in the event cancellations. The Clintons notoriously have zero tolerance for deviations from campaign messaging.

“The awkward indignities of a populist from Vermont defending a corrupt insider from Washington, D.C., were on full display this morning as Bernie Sanders struggled to defend Hillary Clinton’s big bank ties and Clinton Foundation conflicts — just after it was revealed she spent the primary mocking his supporters as broke jobless millennials building shrines to Bernie in their parents’ basements,” Raj Shah, the research director and deputy communications director for the Republican National Committee, said in a statement Sunday.

The GOP nominee suggested Sanders should bail from more than campaign events.

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“Bernie should pull his endorsement of Crooked Hillary after she decieved [sic] him and then attacked him and his supporters,” Trump tweeted Sunday night.