Photos: Alex Wong/Getty Images; Mandel Ngan/AFP via Getty Images

Mike Bloomberg and Bernie Sanders' presidential campaigns sparred Wednesday over which 78-year-old is in better cardiac health.

The big picture: The line of attack comes as Sanders, the race's current frontrunner, is set to meet Bloomberg, who has spent hundreds of millions of dollars to make a splash in the race, face-to-face for the first time on the debate stage in Nevada.

The state of play: Sanders' national press secretary Briahna Joy Gray told CNN that Bloomberg "has suffered heart attacks in the past."

  • Bloomberg senior adviser Tim O'Brien hit back on Twitter, calling the statement "a Trumpy lie from the Sanders campaign, which rolls like Trump in many ways."
  • Bloomberg released a letter from his doctor last year, which featured no mention of a heart attack but did note that he underwent coronary stent placement surgery in 2000.
  • Bloomberg campaign manager Kevin Sheekey said in a statement that the surgery occurred after a positive stress test and has been "public for years" since Bloomberg, who holds a pilot's license, had to inform the FAA when it occurred.
  • Gray later walked back her statement about Bloomberg on Twitter, stating that she "misspoke" and that he "underwent the same stent procedure as Bernie."

The other side: Sanders suffered a heart attack last October that briefly sidelined him from the campaign trail.

  • The Vermont senator released letters from his primary physician and two cardiologists late last year stating that he "has the mental and physical stamina to fully undertake the rigors of the presidency."
  • Sanders said this week that he was unlikely to disclose any additional medical information, stating that he has already put forth "quite as much as any other candidate has," reports The Hill.

Go deeper: Bernie Sanders released from hospital following heart attack

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Facebook boycott organizers share details on their Zuckerberg meeting

Facebook is in the midst of the largest ad boycott in its history, with nearly 1,000 brands having stopped paid advertising in July because they feel Facebook hasn't done enough to remove hate speech from its namesake app and Instagram.

Axios Re:Cap spoke with the boycott's four main organizers, who met on Tuesday with CEO Mark Zuckerberg and other top Facebook executives, to learn why they organized the boycott, what they took from the meeting, and what comes next.

Boycott organizers slam Facebook following tense virtual meeting

Illustration: Sarah Grillo/Axios

Civil rights leaders blasted Facebook's top executives shortly after speaking with them on Tuesday, saying that the tech giant's leaders "failed to meet the moment" and were "more interested in having a dialogue than producing outcomes."

Why it matters: The likely fallout from the meeting is that the growing boycott of Facebook's advertising platform, which has reached nearly 1000 companies in less than a month, will extend longer than previously anticipated, deepening Facebook's public relations nightmare.

Steve Scalise PAC invites donors to fundraiser at Disney World

Photo: Kevin Lamarque-Pool/Getty Images

House Minority Whip Steve Scalise’s PAC is inviting lobbyists to attend a four-day “Summer Meeting” at Disney World's Polynesian Village in Florida, all but daring donors to swallow their concern about coronavirus and contribute $10,000 to his leadership PAC.

Why it matters: Scalise appears to be the first House lawmakers to host an in-person destination fundraiser since the severity of pandemic became clear. The invite for the “Summer Meeting” for the Scalise Leadership Fund, obtained by Axios, makes no mention of COVID-19.