Joe Biden is in danger of losing to President Donald Trump in November, Sen. Bernie Sanders, I-Vt, fears, according to three sources for The Washington Post.

Sanders concerns are based on Biden’s appeal to centrist voters as opposed to progressives with a vague campaign platform, the anonymous sources told the Post.

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Sanders fears Biden’s lack of focus on healthcare, economic plans, or young firebrand progressives like Rep. Alexandria Ocasio-Cortez, D-N.Y., are going to cost Biden votes.

Despite reports, Sanders campaign manager Faiz Shakir told the Post that Sanders is "working as hard as he can" to help Biden make strategic adjustments, including the need for "stronger outreach to young people, the Latino community, and the progressive movement."

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