A screenshot of the video of John McCain with Joe Biden, titled "A unlikely friendship." Photo: Democratic National Convention/YouTube

Cindy McCain recorded a video message for Tuesday's Democratic National Convention, paying tribute to an "unlikely friendship" forged between former Vice President Joe Biden and her late husband, Sen. John McCain (R-Ariz.)

Why it matters: Cindy McCain, who describes herself as a "Reagan conservative, a little more liberal on some social issues," is the latest Republican to lend her voice to the Democratic convention, after four conservatives including former Ohio Gov. John Kasich spoke Monday.

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National security officials endorse Biden

Photo: Jim Watson/Getty Images

A group of 489 former national security leaders, including Paul Selva, a retired four-star general and the vice chairman of the Joint Chiefs of Staff under Trump, have endorsed Joe Biden for president.

The big picture: Among the names signing Thursday’s letter: Sean O'Keefe, a former Navy secretary for President George H.W. Bush; Richard Armitage, deputy secretary of state for President George W. Bush; and Admiral Steve Abbot (ret.) who also worked in the last Bush White House.

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Coronavirus dashboard

Illustration: Sarah Grillo/Axios

  1. Global: Total confirmed cases as of 12:30 p.m. ET: 32,626,165 — Total deaths: 990,134 — Total recoveries: 22,523,822Map.
  2. U.S.: Total confirmed cases as of 12:30 p.m. ET: 7,040,313 — Total deaths: 203,918 — Total recoveries: 2,727,335 — Total tests: 99,488,275Map.
  3. States: U.S. reports over 55,000 new coronavirus cases — "We’re not closing anything going forward": Florida fully lifts COVID restaurant restrictions.
  4. Health: Young people accounted for 20% of cases this summer — The long-term pain of the mental health pandemicFewer than 10% of Americans have coronavirus antibodies.
  5. Business: Millions start new businesses in time of coronavirus.
  6. Education: Summer college enrollment offers a glimpse of COVID-19's effect.

America on edge as unrest rises

Louisville on Wednesday. Photo: Jon Cherry/Getty Images

Rarely have national security officials, governors, tech CEOs and activists agreed as broadly and fervently as they do about the possibility of historic civil unrest in America.

Why it matters: The ingredients are clear for all to see — epic fights over racism, abortion, elections, the virus and policing, stirred by misinformation and calls to action on social media, at a time of stress over the pandemic.