Story highlights Bernie Sanders' campaign is downsizing its field staff

The decision follows a bad night for Sanders

(CNN) Bernie Sanders' campaign is laying off more than 200 workers, campaign manager Jeff Weaver said Wednesday.

The campaign is downsizing from its current 550-member team to between 325 to 350 workers, said Weaver, who added that at one point the Sanders' staff numbered more than 1,000.

The decision follows a bad night for Sanders, in which he lost four out of five East Coast states that voted on Tuesday.

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"The calendar is coming closer to the end and there are not that many states going forward ... it's the natural evolution of every campaign," Weaver told CNN.

Sanders announced the layoffs in an interview with The New York Times

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