As President Joe Biden made the decision to step aside from his bid for reelection, he had the support of his wife, Jill.

The first lady's communications director, Elizabeth Alexander, said Jill was "supportive of whatever road he chose" in the 2024 election.

"Down to the last hours of the decision only he could make, she was supportive of whatever road he chose," Alexander said of Jill.

"She’s his biggest believer, champion, and always on his side, in that trusted way only a spouse of almost 50 years can be,” Alexander said.

Several major political action committees representing AAPI, Black and Latino voters have endorsed Vice President Kamala Harris for president.

The AAPI Victory Fund, The Collective PAC and Latino Victory Fund all announced the endorsement on Sunday.

"We will fight with all of our might to make her the first South Asian and Black woman ever to serve as President of the United States," spokespeople for the AAPI Victory Fund said in a statement.

Independent presidential candidate Robert F. Kennedy Jr. blasted Harris in a press conference on Sunday, criticizing her on everything from foreign policy to civil rights and her work as district attorney in California.

"I think, you know, Kamala Harris is the party of war. She is a war hawk -- you know, the Democratic Party was always the peace party. Kamala Harris is a war hawk on Ukraine. She's a war hawk on China," he said.

Kennedy also accused Harris of having "one of the worst civil rights record of any public official," calling her complicit in the "school-to-prison pipeline."
-ABC News' Will McDuffie

President Joe Biden had been facing growing pressure from his own party to step aside from the 2024 race, despite his repeated assurances that he plans to stay in the race.

Pressure had mounted after his disastrous June debate with former President Donald Trump which left many within the Democratic Party questioning if he could win his reelection campaign. Before he made his announcement, at least 40 congressional lawmakers had publicly called on Biden to step aside.

Biden's decision Sunday -- which came as he recovers from COVID-19 -- took members of his staff by surprise, despite his repeated assurances doing little to decrease public pressure for him to step down.

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