Photo: FilmMagic/FilmMagic for U.S.VETS

Cindy McCain, the wife of the late Sen. John McCain, has joined the board of Joe Biden's presidential transition team.

Why it matters: McCain, who endorsed Biden last week after allegations in The Atlantic that President Trump had denigrated members of the military, joins former Veterans Affairs Secretary Bob McDonald as the second registered Republican on the transition board.

The big picture: Other high-profile members of the transition board include New Mexico Gov. Michelle Lujan Grisham, former 2020 presidential candidate Pete Buttigieg, former Surgeon General Vivek Murthy, former national security adviser Susan Rice, and former Deputy Attorney General Sally Yates, according to the Wall Street Journal.

What they're saying: "This transition is like no other, preparing amid the backdrop of a global health crisis and struggling economy, which makes Mrs. McCain’s experience as a business woman, philanthropist, and longtime advocate for issues impacting women and children all the more valuable," said transition co-chair and former Sen. Ted Kaufman.

  • "Diversity of ideology and background is a core value of the transition, and today’s announcement is another step demonstrating the importance of unifying the country under a Biden-Harris administration.”

Go deeper: The top Republicans who aren't voting for Trump in 2020

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Hunter Biden saga dominates online debate

Data: NewsWhip; Table: Axios Visuals

The mainstream media turned away. But online, President Trump's charges about Hunter Biden were by far the dominant storyline about the final presidential debate, according to exclusive NewsWhip data provided to Axios.

  • Coverage of business dealings by Joe Biden's son — and pre-debate allegations by one of his former business associates, Tony Bobulinski — garnered more than twice as much online activity (likes, comments, shares) as the runner-up.

Pence to continue traveling despite aides testing positive for COVID-19

Marc Short with Pence in March. Photo: Drew Angerer/Getty Images

Marc Short, Vice President Mike Pence’s chief of staff, tested positive for the coronavirus Saturday and is quarantining, according to a White House statement.

Why it matters: Short is Pence's closest aide, and was one of the most powerful forces on the White House coronavirus task force. Pence and second lady Karen Pence tested negative for the virus on Sunday morning, according to the vice president's office.

AOC: "Extremely important" that Biden offer Bernie Sanders a Cabinet position

Rep. Alexandria Ocasio-Cortez (D-N.Y.) said on CNN's "State of the Union" Sunday that she believes it's "extremely important" that Joe Biden offer Sen. Bernie Sanders and other progressive leaders Cabinet positions if he's elected president.

The big picture: Ocasio-Cortez was pressed repeatedly on policy differences between her and the more moderate Biden, including her opposition to fracking and support for Medicare for All. She responded that it would be a "privilege" and a "luxury" to be able to lobby a Biden administration on progressive issues, insisting that the focus right now should be on winning the White House.