Election 2024 updates: Beshear says Vance 'ain't from Appalachia' at Harris event

A coalition of major gun safety groups announced their joint endorsement Tuesday of Harris' bid for the top of the ticket, framing the choice for who holds the Oval Office as a matter of grave safety.

The coalition included Everytown for Gun Safety and its grassroots networks Moms Demand Action and Students Demand Action, as well as Newtown Action Alliance and Community Justice Action Fund.

"Throughout her career in public service, Vice President Harris has been a powerful force in the fight for our freedoms -- including the freedom to live free from the threat of gun violence. Gun extremists have a dream ticket with Trump and Vance, and our volunteers stand ready to do everything in our power to elect Vice President Harris back into the White House," Angela Ferrell-Zabala, executive director of Moms Demand Action, said in a statement to ABC News.

Everytown backed the Biden-Harris ticket last year. Brady, another gun-control group, which backed Harris on Sunday, also reiterated its support Tuesday.

"A vote for Kamala Harris is a vote to free America from the grips of gun violence. This November, our lives are on the ballot," Kris Brown, the president of Brady, said in a statement.

Similar groups, Team ENOUGH and GIFFORDS -- founded by Gabby Giffords -- are also endorsing Harris. Giffords' husband is Arizona Sen. Mark Kelly, who a source tells ABC News is among a list of vice presidential hopefuls being vetted to be her running mate.

Lauding the Biden-Harris administration's work on gun safety, some of the groups specifically highlighted the work Harris has already done to address gun violence nationwide -- and in Black and Hispanic communities.

"Everything we've worked towards could be rolled back on day one with the wrong administration in charge," José Alfaro, executive director of the Community Justice Action Fund, said in a statement. "As Vice President, Harris has shown unwavering dedication to addressing gun violence nationwide as a public health issue, investing hundreds of millions of dollars in community violence intervention and leading the first-ever White House Office of Gun Violence Prevention. These acts carry on the legacy of Black women, pushing, fighting, and willing change to happen in the gun violence prevention movement."

-ABC News' Sasha Pezenik

Harris rallied voters in battleground Wisconsin on Tuesday, her first presidential campaign event since securing enough delegate pledges for the Democratic nomination if they keep their word -- and used the rally to sharply frame her race against former President Donald Trump.

Harris attacked Trump and his running mate, Ohio Sen. JD Vance, on the issue of abortion and Project 2025, the conservative presidential transition blueprint fronted by the Heritage Foundation.

"We'll stop Donald Trump's extreme abortion bans because we trust women to make decisions about their own body and not have the government tell them what to do," Harris said to raucous applause. "And when Congress passes the law to restore reproductive freedoms, as president of the United States, I will sign it into law."

During the rally, Harris touted her previous experience while making a dig at Trump.

"In those roles, I took on perpetrators of all kinds: predators who abused women, fraudsters who ripped off consumers, cheaters who broke the rules for their own gain," she said. "So, hear me when I say, I know Donald Trump's type."

-ABC News' Fritz Farrow and Sarah Beth Hensley

Biden briefly spoke with reporters as he boarded Air Force One at Dover Air Base on Tuesday.

The president, who tested negative for COVID-19, said he was "feeling well," and didn't respond to questions about bowing out of the race.

Biden had a mask in hand, which he placed in his pocket after he got out of the car before getting on the plane.

The president gave a salute and a thumbs up as he boarded.

-ABC News' Cheyenne Haslett

Senate Democratic Leader Chuck Schumer and House Minority Leader Hakeem Jeffries voiced their strong support for Harris to be the Democratic nominee for president in a press conference Tuesday afternoon.

"We are here today to throw our support behind Vice President Kamala Harris," Schumer said.

"We are brimming with excitement, enthusiasm and unity," Schumer said as he announced that Harris would be the candidate. "She said she would work to earn the support of our party and boy did she do so, in quick order."

Schumer noted a "surge of enthusiasm from every corner of our party uniting behind Vice President Harris." He touted her record and said her candidacy is the "next chapter in our quest" to ensure former President Donald Trump does not become retake the White House.

Jeffries said Harris is "ready, willing and able to lead us into the future."

"I am proud to strongly endorse Kamala Harris to be the 47th President of the United States of America," Jeffries said.

-ABC News' Allison Pecorin