Cindy McCain. Photo: Ralph Freso/Getty Images)

Cindy McCain formally endorsed Joe Biden for president on Tuesday, calling the former Vice President the only "candidate in this race who stands up for our values as a nation."

Why it matters: McCain, the widow of the late Arizona Sen. John McCain, appeared in a video presentation at last month's Democratic National Convention praising Biden, with whom her husband had a longtime bipartisan friendship. With an official endorsement, she will join a number of prominent people in Republican circles to endorse the Democratic candidate over Trump.

  • Biden earlier Tuesday told reporters President Trump's alleged comments about service members, reported in The Atlantic earlier this month, played a role in her decision to endorse him.

What she's saying: "My husband John lived by a code: country first. We are Republicans, yes, but Americans foremost. There's only one candidate in this race who stands up for our values as a nation, and that is @JoeBiden," McCain tweeted.

  • "Joe and I don't always agree on the issues, and I know he and John certainly had some passionate arguments, but he is a good and honest man. He will lead us with dignity," she wrote in another tweet.
  • She continued: "He will be a commander in chief that the finest fighting force in the history of the world can depend on, because he knows what it is like to send a child off to fight."
  • Biden responded in a tweet, writing: "Cindy — I'm deeply honored to have your support and your friendship. This election is bigger than any one political party. It requires all of us to come together as one America to restore the soul of the nation. Together, we'll get it done."

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

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Trump-Biden venom on display during final debate

Photos: Brendan Smialowski/AFP via Getty Images; Jim Watson/AFP via Getty Images

Joe Biden twice referred to President Trump as "this guy," and Trump called the former vice president's family "like a vacuum cleaner" for foreign money.

Why it matters: The personal venom — during Thursday's final presidential debate, in Nashville — was a reminder that even during a more normal debate, nothing this year is normal.

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Oct 23, 2020 - Energy & Environment

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Former Vice President Joe Biden. ANGELA WEISS / Getty Images

Joe Biden's campaign is looking to blunt attacks in response to his comments in Thursday night's debate about a "transition from the oil industry," as Republicans look to make the remarks a liability in the closing days of the race.

Driving the news: Biden campaign spokesperson Bill Russo, in comments circulated to reporters Friday afternoon, said the former VP "would not get rid of fossil fuels," but wants to end subsidies.

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White House Chief of Staff Mark Meadows defended Vice President Pence's decision to continue traveling and campaigning despite his exposure to aides who have tested positive for COVID-19, saying Sunday that Pence is exempt from CDC guidelines because he is "essential personnel."

Why it matters: CDC guidelines call for people who have been exposed to the virus to quarantine for 14 days. Meadows said on CNN's "State of the Union" that Pence will wear a mask when he travels and argued that "he's not just campaigning," pointing to the Israel-Sudan normalization agreement announced by the White House last week.