US President Joe Biden said dropping out of the race for the presidency and endorsing his vice president, Kamala Harris, as the Democratic candidate was the best way to unite the country, despite his ambition to win a second term.
Biden's announcement on Sunday to not seek re-election followed a disastrous June debate with Republican candidate Donald Trump that exacerbated questions about his ability to win, or to serve another four years if he succeeded.
In his address to the nation from the Oval Office on Wednesday (local time), he said he believed he earned reelection because of his record during his first term.
"But nothing, nothing can come in the way of saving our democracy. That includes personal ambition," he said. "So I decided the best way forward is to pass the torch to a new generation. That is the best way to unite our nation.”
Harris, the first Black woman and Asian American to serve as vice president, will become the first woman elected president if she prevails on November 5. In the three days since Biden's decision, Harris has pulled in broad support across the Democratic Party and revitalized its election campaign.
Biden praised Harris as a strong leader who would make an effective president.
Hours earlier, Trump tried to quash some of that momentum in an aggressive speech at the rally, his first since Harris' emergence changed the race. "She is a radical Left lunatic who will destroy our country if she ever gets elected," he said.
Trump routinely uses insults in attacking his opponents and made clear he planned to ignore advice that he take a softer line. "I'm not gonna be nice!" he told his cheering supporters in Charlotte.
He attacked Harris as a driving force in the Biden administration who should be held responsible for its policies on immigration and other issues.
"As border czar, Kamala threw open our borders that allowed 20 million illegal aliens to stampede into our country from all over the world," Trump said.
"I will terminate every single open border policy of the Biden Harris administration and we will seal the border and we will stop Kamala Harris invasion without delay," the former president said.
Biden put Harris in charge of working with countries in Central America to help stem the tide of migration, but she was not given responsibility for border security nor was she named "border czar."
Trump also touched on abortion, an issue that Democrats had long seen abortion rights as a winning issue for them.
"When you compare my position on abortion to that of Kamala Harris, my position is eight points higher in the polls. And that's because she is so radical," he said.
Harris has served as point person for the Biden administration on the issue of abortion, which is expected to become even more central to the campaign with her at the top of the ticket.
'PASS THE TORCH'
Biden said he intended to focus on his work as president in the six months left in his term.
"That means I will continue to lower costs for hard-working families and grow our economy. I will keep defending our personal freedoms and our civil rights – from the right to vote – to the right to choose,” he said, according to his prepared remarks, outlining some themes that Harris is expected to build her campaign around.
The president returned to Washington on Tuesday afternoon after isolating with Covid at his home in Delaware, where he made the announcement that he was ending his campaign.
The Democratic National Committee's rules committee agreed on Wednesday on a plan to formally nominate Harris as soon as August 1 - before the party's August 19-22 convention in Chicago - with Harris picking a running mate by August 7.
Earlier on Wednesday, the 59-year-old vice president called on a rally of more than 6000 Black women in Indianapolis to help her revitalise the Democratic campaign.
Harris spoke at an event in Indianapolis hosted by the Zeta Phi Beta Sorority, which was founded at Howard University, the historically Black college she attended. She hopes to tap sororities' multi-generational network of Black women - who played an important role in Biden's 2020 victory - to deliver strong voter turnout for Democrats again in November.
"I thank you. And now, in this moment, our nation needs your leadership once again," Harris said.
Trump, coming off a triumphant week in which his party unified around his presidential bid after a failed assassination attempt two weekends ago, has had to watch as Biden's sudden departure from the race shifted the narrative and sparked a surge of attention toward Harris at his expense.
Harris and Trump are closely competitive, public opinion polls showed this week.
A Reuters/Ipsos poll completed on Tuesday showed Harris with a marginal two-percentage-point lead over Trump, 44% to 42%. A CNN poll conducted by SSRS showed Trump leading Harris, 49% to 46%. Both findings were within the polls' margins of error.
The Harris campaign on Wednesday said it had raised $US126 million ($NZ213m) since Sunday, with 64% of donors making their first contribution of the 2024 campaign.
