As a member of the advisory board, McCain will offer her input while the Democrat’s team turns his campaign promises into policies that can be enacted once he takes office, as The Wall Street Journal reported.
The GOPer — whose late husband served as Arizona senator and party stalwart for more than 30 years before dying of cancer in 2018 — is expected to advise the team on issues affecting women and children, the report said.
"I think my husband would be very pleased," Cindy McCain, who endorsed the former vice president and is part of his transition team, told CNN's Anderson Cooper on Monday.
"We were good friends with the Bidens," she continued. "And I just know he is looking down and going, 'You did the right thing.'"
McCain, who was featured in a video that aired during the Democratic National Convention, leaned heavily into Biden's character and empathy in her endorsement and said she was hoping to reach suburban women who may have been on the fence on who to support. She also appeared in an October ad for the Biden campaign, saying that he would "always fight for the American people, just like John did."
She is the second Republican to sign on to formally counsel the president-elect’s team, joining former Obama administration Veterans Affairs Secretary Bob McDonald on the board.
The board recently met for the first time and is expected to meet again in the coming weeks, the report states.
The announcement comes after McCain endorsed Biden over President Trump in September, saying he was the only candidate in the race who she believed would “stand up” for American values.
On Sunday, she congratulated Biden on his election win and urged Trump to do his part “by conceding in a gracious manner” — as her husband did to Barack Obama, former veep Biden’s boss, after overwhelmingly losing to him in the 2008 presidential race.
Cindy McCain said Monday that she believes Biden could make good on his promise to unify the nation.
When asked if she believed Biden's commitment to working across the aisle to get things done was possible in the current political climate, she replied, "I really do. I would not have supported Vice President Biden if I had thought ... anything but that."
She noted that Biden and her late husband had experience "working directly across the aisle with each other, disagreeing a lot, but they were able to get things done because they did for the good of the country."
"That is the difference in President-elect Biden with regards to this White House," she said. "I believe they can get things done and I also think that they're going to heal the country by working that way -- and that's of course what we all want."