Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE’s campaign on Thursday unveiled endorsements from 40 high-profile Republicans.

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During a Thursday conference call with reporters, Clinton campaign chairman John Podesta announced the new endorsements, including former GOP administration officials, former lawmakers and prominent Republicans in battleground states.

It's only the latest effort from the campaign to tout support among Republicans and independents who oppose GOP nominee Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE.

Together for America, a campaign group focused on building support for Clinton among those groups, launched in August and announced 50 endorsements at the time.

“The growing group of Republicans and Independents who are backing Hillary is a testament to how important the choice is in this election,” Podesta said on the call.

“It's really not about Republicans or Democrats, it's about what country we will be, it's about our children's future and which candidate can bring people together to get things done, which candidate is fit to serve the office of president and commander in chief.”

Thursday’s endorsements include former Reps. Sherwood Boehlert (R-N.Y.), Claudine Schneider (R-R.I.), and John Schwarz (R-Mich.) in addition to former officials in the Ford, Reagan and George W. Bush’s administrations.

Schneider, who served in Congress from 1981 to 1991, said Monday’s presidential debate showed Clinton is ready to serve in the White House.

“I was proud to be elected as part of the Reagan Revolution, to work with President Reagan, and to be a Republican my entire adult life,” she said on the call. “But when it comes to this election, I have to put my country ahead of my party, and that means voting for Hillary Clinton.”

The rollout also comes one day after former Sen. John Warner (R-Va.) endorsed Clinton during a campaign event in the battleground state of Virginia alongside her running mate, Sen. Tim Kaine Timothy (Tim) Michael KaineTrump meets with potential Supreme Court pick Amy Coney Barrett at White House Names to watch as Trump picks Ginsburg replacement on Supreme Court Barrett seen as a front-runner for Trump Supreme Court pick MORE (D-Va.).