Former Deputy Attorney General Sally Yates Sally Caroline YatesButtigieg, former officials added to Biden's transition team The Hill's 12:30 Report: Delegates stage state-centric videos for the roll call Trump fires back at Yates for convention speech: 'Terrible AG' MORE, who was fired by President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE, endorsed former Vice President Joe Biden Joe BidenSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE's White House bid on Thursday.

Yates cited Biden’s “vast experience” and said she had witnessed him “grapple with some of the country’s greatest challenges” in the Obama administration.

“I trust him to always put the country’s interests before his own; to tell us the truth; to appeal to our best, not our worst, instincts; to unite rather than divide us; and to always treat the presidency as a privilege rather than an entitlement,” she added.

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The former deputy attorney general noted that she is “not a political person,” but “our country needs Joe Biden.”

“But there is too much at stake now for any of us to sit on the sidelines,” she said. “This is indeed a battle for the soul of America — who we are, or at least who we have always aspired to be.”

“While our country can survive four years of our current president, at the end of eight years, I fear that we will not recognize the nation that we have become,” she added.

Trump fired Yates in 2017 after she refused to defend his travel ban targeting several Muslim-majority countries. Since then, she has been an outspoken critic of the president.

Her endorsement comes after Biden had a strong week, winning contests in Idaho, Michigan, Missouri and Mississippi. His opponent, Sen. Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE (I-Vt.), is projected to win North Dakota and leads in Washington state, where votes are still being counted.

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The Vermont senator on Wednesday vowed to stay in the race, despite his losses on Tuesday.

Currently, Biden has collected 864 delegates, and Sanders has earned 710, although not all of the delegates from Super Tuesday and this Tuesday’s races have been allocated.

The Biden campaign also said on Thursday that the former vice president has received endorsements from more than 80 Georgia officials.