However, the campaign has remained firm that the Vermont senator has no intention of conceding ahead of the convention in July.
"Are we going to take our campaign for transforming the Democratic Party into the convention? Absolutely," Sanders told reporters in Burlington on Sunday.
And his spokesperson Michael Briggs reiterated to USA Today on Tuesday that Sanders "will be a candidate through the Democratic National Convention in Philadelphia, as he has said before."
Sanders delivered his remarks as voters in Washington, D.C. cast ballots in the nation's final primary.
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