Bernie Sanders’s campaign and its supporters are urging New York’s election officials not to cancel its June presidential primary, even though the Vermont senator has suspended his campaign for the Democratic Party’s nomination to face President Trump.

Democratic commissioners of the New York State Board of Elections will meet Monday to consider a resolution that would scrap the primary. Mr. Sanders endorsed former Vice President Joe Biden on April 13, but Mr. Sanders said when he suspended his campaign that he hoped to keep amassing delegates to influence the Democratic Party’s platform and rules.

Mr. Biden has won 1,305 delegates to the party’s convention, compared with Mr. Sanders’s 939. New York has 274 delegates in play. Sanders backers say canceling the election would send an exclusionary message at a time when party leaders should be focused on uniting Democrats behind Mr. Biden.

“This could be a public-relations disaster for the party,” said George Albro, co-chair of the New York Progressive Action Network, which supports Mr. Sanders.