Bernie SandersBernie SandersDemocrats worry they don't have right candidate to beat Trump Overnight Health Care: Top health official defends contract payments to Trump allies | Vaping advocates confident Trump will turn from flavor ban | Sanders gets endorsement from nurses union Krystal Ball credits Gabbard's upswing in 2020 race to 'feckless' Democratic establishment MORE's campaign manager on Monday defended the liberal presidential candidate backing the primary opponent of the Democratic National Committee chairwoman, saying she is not progressive enough.

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“He has supported progressive candidates around the country," Jeff Weaver said on MSNBC’s "Andrea Mitchell Reports." "In this race in Florida, Debbie Wasserman Schultz’s opponent is a much more progressive candidate. It’s only natural that he would support the more progressive alternative in that race.”

Sanders on Sunday endorsed Tim Canova in his battle with Wasserman Schultz over Florida’s 23rd Congressional District.

“Well, clearly, I favor her opponent,” the Vermont senator said on CNN’s “State of the Union." "His views are much closer to mine than as to Wasserman Schultz.”

Wasserman Schultz responded by vowing that she will remain impartial in Sanders’s fight with Hillary ClintonHillary Diane Rodham ClintonDemocrats worry they don't have right candidate to beat Trump Krystal Ball credits Gabbard's upswing in 2020 race to 'feckless' Democratic establishment Outsider candidates outpoll insider candidates MORE over the Democratic presidential nomination.

“Even though Senator Sanders has endorsed my opponent, I remain, as I have been from the beginning, neutral in the presidential Democratic primary,” she on Saturday said in a statement. "I look forward to working together with him for Democratic victories in the fall.”

Weaver on Monday said that Sanders’s campaign remains dissatisfied with Wasserman Schultz’s handling of the Democratic nominating process.

“I think there has been a number of instances of unfairness,” he said. "I think on issue after issue there’s been evidence that she certainly been against the Sanders campaign.

“Certainly the debate scheduling through this process, the handling of the data issue, the joint-fundraising agreement which is taking money out of state parties and giving it to the DNC, the appointment of standing committees to the convention where there are 75 appointments and she only picked three of our people and appointed chairs who were very, very hostile to our campaign.”

Canova’s congressional campaign on Monday announced Sanders’s support had helped it raise more than $250,000 since getting the lawmaker’s blessing.

Clinton remains the Democratic presidential front-runner nationwide, boasting 1,768 pledged delegates to Sanders’s 1,497. When including superdelegates, Clinton total swells to 2,293 compared to Sanders total of 1,536. A candidate needs a combined delegate total of at least 2,382 to avoid a contested convention.