Tim Canova, a Florida Democrat challenging Rep. [crscore]Debbie Wasserman Schultz[/crscore] in the 23rd Congressional District primary, announced Thursday his campaign is close to receiving $1 million in donations in May, calling it a “historic haul.”

The Canova campaign said the donations have come from more than 45,000 contributors. Vermont Sen. Bernie Sanders endorsed Canova on Sunday.

“No House race challenger has ever accomplished a similar feat,” the campaign said in a statement. The fundraising “continues to be fueled by small donors who have given an average of roughly $18 over the past five months.”

“Meanwhile, Debbie Wasserman Schultz continues to solicit huge contributions from wealthy elites and corporations in exchange for votes and favors in Washington,” said the campaign.

Sanders has accused Wasserman Schultz of favoring Hillary Clinton in the party’s presidential primary as chair of the Democratic National Committee.

The news of Canova’s haul comes as Democrats on Capitol Hill are openly speculating about whether she should remain chair of the party.

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