Former Vice President Joe Biden Joe BidenBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Harris faces pivotal moment with Supreme Court battle MORE received endorsements from several Democratic senators shortly after he announced his 2020 presidential campaign on Thursday.

Sens. Christopher Coons Christopher (Chris) Andrew CoonsMurkowski: Supreme Court nominee should not be taken up before election Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (D-Del.) and Bob Casey Robert (Bob) Patrick CaseySecond GOP senator to quarantine after exposure to coronavirus GAO report finds brokers offered false info on coverage for pre-existing conditions Catholic group launches .7M campaign against Biden targeting swing-state voters MORE Jr. (D-Pa.) were among the first to back Biden's bid.

“Joe Biden doesn’t just talk about making our county more just, he delivers results," Coons said in a statement.

Casey said in a tweet that he was "proud to endorse my friend, Joe Biden, for President."

I am proud to endorse my friend, Joe Biden, for President https://t.co/ZWTlwJaQ59 — Bob Casey Jr. (@Bob_Casey) April 25, 2019

Casey added in a statement that "America needs" Biden to be the next president, according to The Associated Press.

“At this make-or-break moment for the middle class, our children and our workers, America needs Vice President Joe Biden to be its next President," he said.

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Sen. Tom Carper Thomas (Tom) Richard CarperThe conservative case for phasing out hydrofluorocarbons Democrat asks for probe of EPA's use of politically appointed lawyers Overnight Energy: Study links coronavirus mortality to air pollution exposure | Low-income, minority households pay more for utilities: report MORE (D), the other senator from Delaware, later endorsed the former vice president.

"In 1982, it was then-Senator Joe Biden who first encouraged me to run for the U.S. House of Representatives. Today, I could not be more proud to endorse my friend Joe as he launches his campaign to be the next President of the United States," Carper said in a statement.

"Joe has spent his career championing policies that help all Americans. He is a tested, experienced leader with a proven track record of getting things done for our country," Carper added.

Democratic Sen. Doug Jones (Ala.) also said in a tweet that Biden can "bring people together" and "find common ground while standing up for what he believes is right."

The quality that makes Joe stand out is his ability to bring people together to find common ground while standing up for what he believes is right. We need to listen to each other & get things done for working people. Joe can, and will, do that. That’s why I support Joe Biden. https://t.co/vxnLQu0XDZ — Doug Jones (@DougJones) April 25, 2019

Biden, who was born in Pennsylvania and has lived the majority of his life in Delaware, announced early Thursday that he would seek the Democratic presidential nomination in 2020.

"If we give Donald Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE eight years in the White House, he will forever and fundamentally alter the character of this nation — who we are — and I cannot stand by and watch that happen," Biden said in a video message.

"Everything that has made America America is at stake," Biden added. "That’s why today I'm announcing my candidacy for president of the United States."

Biden joins a crowded field of more than 20 vying for the Democratic nomination, but he enters the race with an early edge, leading several early polls and having strong national name recognition.

In the House, Rep. Tom Suozzi (D-N.Y.) endorsed Biden early Thursday, saying he “is exactly what America needs right now.”

“He has the experience, the knowledge, the relationships, the gravitas and the integrity to put our country on the right track,” Suozzi said. “Americans are ready for someone in the White House who will directly address the issues and problems they and their families face and do something about solving them. Joe Biden has the ability to do that and that is why I am proud to endorse him for President.”

-- Cristina Marcos contributed to this report, which was updated at 11:21 a.m.