Former Secretary of State and 2016 Democratic presidential nominee Hillary Clinton endorsed former Vice President Joe Biden Tuesday.

The former senator from New York appeared with Biden at a virtual women's town hall related to coronavirus Tuesday. The initial announcement of the event did not include Clinton's involvement, but rather hinted at a "special guest."

"It's a real pleasure to be here with you and to be part of this very important discussion," Clinton said during the town hall. "And I am thrilled to be part of your campaign to not only endorse you, but to help highlight a lot of the issues that are at stake in this presidential election."

A tweet from Clinton earlier Tuesday included "a little hint about who the surprise guest will be" and had a picture of Clinton and Biden with former President Barack Obama.

Biden shortly after retweeted Clinton's post, adding "(I'm with her.)"

Clinton, the first woman to be nominated on a major party's presidential ticket, is the latest Democratic figure to endorse Biden's candidacy. Her endorsement follows those of former President Barack Obama, House Speaker Nancy Pelosi and Sens. Bernie Sanders and Elizabeth Warren.

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"I want to add my voice to the many who have endorsed you to be our president," Clinton said Tuesday.

Biden became the presumptive nominee after Sanders suspended his presidential campaign in early April, and Clinton has repeatedly said she would back the eventual nominee. In the 2016 election, Clinton lost the presidency to Donald Trump but won the popular vote.

Biden referred to Clinton Tuesday as "a woman who should be President of the United States right now" and said he wished he was campaigning for her re-election instead. Clinton and Biden served several years in the United States Senate together, as well as serving together in the Obama Administration, where Clinton was Secretary of State from 2009 to 2013.

During the virtual town hall, Clinton referred to Biden as a friend and colleague.

“I’ve been in the lobby of the Senate. I’ve been in the Cloak Room and I’ve watched Joe bring people together,” she said. "We have a lot of the same values in common, the same work ethic, the same belief in America, the same focus on family."

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“We need a leader – a president – like Joe Biden," she said.

It's unclear how Clinton's endorsement could affect Biden's campaign. Clinton is seen as a polarizing figure for some Democrats; young progressive voters largely supported her rival Sanders in the 2016 Democratic primary. Biden has also struggled with that voting bloc and is working with Sanders on progressive outreach.

Clinton's pending endorsement did bring fire from Republicans. Trump campaign manager Brad Parscale said in a statement, "Trump beat her once and now he'll beat her chosen candidate."