Democratic presidential hopeful former Vice President Joe Biden participates of the seventh Democratic primary debate of the 2020 presidential campaign season co-hosted by CNN and the Des Moines Register at the Drake University campus in Des Moines, Iowa on January 14, 2020. (Photo by Robyn Beck / AFP) (Photo by …

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Conservative pundit and former Secret Service agent Dan Bongino declared Sunday morning that former Vice President Joe Biden is suffering a rapid “cognitive decline” — and he suggested that his sources were “close to the situation.”

Biden’s mental acuity has been a frequent theme of discussion, primarily among conservatives — though Democrats have also acknowledged potential problems, on occasion.

In a Facebook post on Sunday morning, Bongino wrote:

Not a joke and not hyperbole – I’m hearing from people close to the situation that Biden’s cognitive decline is rapidly worsening and is becoming increasingly difficult to mask. The Democrats are going to have to make a decision soon.

At the Democratic Party presidential debate in Houston, Texas, last September, former Secretary of Housing and Urban Development Julián Castro brought up the issue of Biden’s mental decline on the debate stage: “Are you forgetting what you said two minutes ago?” he said, after Biden claimed he had not said that people would have to “buy in” to his health care plan (Castro was correct).

Though Castro later told Breitbart News that he had not meant his remark in precisely that way, Sen. Cory Booker (D-NJ) seemed to echo his criticisms of Biden in post-debate interviews, saying he did not know whether the former vice president had the stamina to run a fully competitive presidential campaign.

President Trump has referred to Biden throughout the campaign as “Sleepy Joe Biden.”

Joel B. Pollak is Senior Editor-at-Large at Breitbart News and the host of Breitbart News Sunday on Sirius XM Patriot on Sunday evenings from 7 p.m. to 10 p.m. ET (4 p.m. to 7 p.m. PT). His new book, RED NOVEMBER, tells the story of the 2020 Democratic presidential primary from a conservative perspective. He is a winner of the 2018 Robert Novak Journalism Alumni Fellowship. Follow him on Twitter at @joelpollak.