We'll be closing this page shortly, so here's a quick round-up of everything you need to know:

• Vice-President Kamala Harris has given her first major campaign speech since securing enough support to become the Democratic Party's nominee for president
• She used it to hit out at Republican candidate Donald Trump - who she says "wants to take our country backward" - as well as outlining her key policy priorities, including tackling child poverty, protecting reproductive rights, and keeping people safe from "the terror of gun violence"
• Meanwhile incumbent President Joe Biden says he will address the nation tomorrow, after announcing his decision not to seek a second term.
• Earlier on Tuesday he headed back to Washington DC from his beach home in Delaware, where he was recovering from Covid
• Elsewhere, Secret Service Director Kimberly Cheatle announced her resignation, after admitting "the most serious operational failure" in the lead up to the assassination attempt on Donald Trump

You can continue to read about Kamala Harris in our main news story here

Plus our correspondent Anthony Zurcher has written a background piece on the vice-president

And here is our story on the resignation of US Secret Service director Kim Cheatle

Thank you for joining us.

Brandon Drenon
Reporting from Washington

Image source, Getty Images

With Joe Biden back at the White House and Kamala Harris and Donald Trump in full campaign mode, Israeli Prime Minister Benjamin Netanyahu is visiting Washington this week.

Thousands of pro-Palestinian protesters will be in Washington for a "day of rage" over the war in Gaza as Netanyahu speaks to Congress on Wednesday, organisers warn.

The message comes after the prime minister said he would "present the truth about our just war", during his first trip outside Israel since the conflict began.

Ahmad Abuznaid, executive director of the US Campaign for Palestinian Rights, says protesters would "make the statement that war criminals like Netanyahu are not welcome" in the US.

Netanyahu was invited by Republican House Speaker Mike Johnson to give his first address to Congress in nine years.

This follows a protest on Tuesday afternoon organised by Jewish Voice for Peace, where hundreds of people protested against US weapons sales to Israel, sitting inside the Cannon House Office Building - the oldest US Congress office building.

Biden is expected to meet Netanyahu this week, while Trump said Tuesday he would also meet the prime minister on Friday.

Image source, Getty Images

After leaving his beach house in Delaware - where he had been isolating with Covid - earlier in the day, Joe Biden said he was back in Washington on Tuesday evening.

"It's great to be back at the White House," the president posted, external on social media, along with a picture of him heading into the building's south entrance.

"This afternoon, I arrived back at the Oval Office and sat down with my national security team for my daily intelligence briefing," he said.

"Serving as your Commander-in-Chief continues to be the greatest honour of my life."

Image source, Getty Images

With Kamala Harris closing in on the Democratic nomination, talk has turned to her running mate.

She will need to pick one by the time Democratic party delegates vote next month at a convention in Chicago to officially confirm who is on the ticket.

Historically, vice-presidents are picked to complement a candidate and strategists believe for that reason she may pick a white man from a swing state.

Names in the mix are said to include:

Josh Shapiro - Pennsylvania Governor

Andy Beshear - Kentucky Governor

Mark Kelly - Arizona Senator

Roy Cooper - North Carolina Governor

JB Pritzker - Illinois Governor

Pete Buttigieg - Transportation Secretary

William McRaven - Retired Admiral

You can read more about all the possible picks here.

Earlier today we brought you the news that the head of the US Secret Service, Kimberly Cheatle, plans to quit after security lapses in the run up to last week's assassination attempt on Donald Trump.

An interim replacement has since been announced, with Homeland Security Secretary Alejandro Mayorkas announcing that Ronald L Rowe Jr will serve as acting director of the Secret Service.

In a post on X, Mayorkas says he appreciates Rowe's "willingness to lead the Secret Service at this incredibly challenging moment".

Kamala Harris's candidacy has been endorsed by 350 foreign policy and diplomacy heavyweights from the Democratic Party in a letter released on Tuesday.

The open letter says Harris brings more national security experience than the four presidents before President Joe Biden, citing her role in the US response to the war in Ukraine and Iranian attacks on Israel.

Former Secretaries of State Hillary Clinton and John Kerry, as well as former National Security Advisors Thomas Donilon and Susan Rice, were among those who signed the letter.

A Republican member of the House of Representatives has introduced articles of impeachment against Vice-President Kamala Harris.

In the resolution written by Representative Andy Ogles, it accuses her of high crimes and misdemeanours over her handling of immigration across the US-Mexico border.

The process likely won't advance, but signals that Republican figures are focusing their attacks on the presumptive Democratic nominee – and the issue of the border.

Vice-President Kamala Harris leads a national poll with 44% compared to Donald Trump's 42%, according to Reuters and Ipsos.

Harris' two point lead against Trump compares to President Biden's two-point deficit in a poll released last week – before his exit from the race.

The poll was conducted on Monday and Tuesday this week, following the Republican National Convention, Biden's exit and his endorsement of Harris as the new Democrat presidential candidate.

Harris' campaign sees new levels of enthusiasm among Democratspublished at 20:59 British Summer Time 23 July

20:59 BST 23 July

Anthony Zurcher
BBC North America correspondent

Image source, Reuters

What a difference three days make. On Sunday morning, Democrats were wallowing in despair, their elderly presidential candidate sequestered because of Covid as a growing number in the party were calling for him to step aside.

Now, Democrats have a new presumptive nominee, Kamala Harris, and the enthusiasm at her campaign rally in Milwaukee, Wisconsin, was palpable.

For the first time since Biden’s disastrous debate with Donald Trump at the end of June, Democrats seemed hopeful – even excited – about the campaign to come.

Harris’s White House bid is only just getting off the ground, and her challenge will be to maintain this level of enthusiasm and translate it into turnout at ballot box when voting starts in a matter of a few months.

She will have to do so in the face of withering attacks from Trump and the Republicans that have only just begun.

Vice-President Kamala Harris has delivered her first speech since securing the support of a majority of Democratic delegates to become the party's nominee for president.

Watch her speak to thousands of supporters at a rally in the battleground state of Wisconsin in the clip above.

Anthony Zurcher
BBC North America correspondent

The path for Vice-President Kamala Harris to secure the Democratic presidential nomination is clearing.

That may end up being the easy part. The most formidable challenge – defeating Republican nominee Donald Trump in November – is still to come. Her elevation to the top of ticket would bring new strengths for the Democrats, but it also exposes weaknesses that were less of a concern with Biden.

This renewed sense of enthusiasm has seen Harris raise more than $80m (£62m) in new donations in the 24 hours since Biden’s announcement – the biggest one-day total of any candidate this election cycle.

Harris, if she becomes the nominee, also defuses one of the most effective attacks the Republicans have levelled against their opponent - his age.

But for all her potential strengths, there is a reason why some Democrats were initially reluctant to push Biden to step aside, given that Harris would be the clear successor.

Despite generating Democratic enthusiasm on the subject of abortion, her record as vice-president has been mixed.

• You can read more about whether Harris has what it takes to beat Trump here

Former US president Donald Trump says he is "willing" to take part in at least one presidential debate with Kamala Harris.

In a call with reporters, the Republican nominee for president says: "Oh, yes, absolutely. I want to. I think it's important," adding: "I would be willing to do more than one debate, actually."

Image source, Reuters

We've just heard Kamala Harris speak for the first time since she became the presumptive Democratic presidential candidate for the November election.

She addressed thousands of supporters in Milwaukee, Wisconsin, one of the key swing states which will decide the race for the White House. Here are the top lines:

• Harris paid tribute to Biden, saying his accomplishments in politics are "unmatched in modern history"
• She repeated an attack line contrasting her background as a prosecutor against her opponent's convictions, saying "I know Donald Trump's type"
• Harris said her campaign had seen the "best 24 hours of grassroots fundraising in campaign history"
• She set out her policy priorities on tackling child poverty, union rights, affordable healthcare and being able "to retire with dignity"
• Harris said she would "stop Donald Trump's extreme abortion bans" before telling the crowd, "We have an election to win"

Image source, Reuters

Harris has ended her first campaign rally since becoming the presumptive Democratic nominee for president.

What kind of country do we want to live with? Harris asked the crowd.

Do we want to live in chaos and hate, she asked - adding: "We each have the power to answer that question."

"In the next 105 days, we have work to do," she added, before declaring: "And we have an election to win".

Cheers and applause erupted in the audience.

She asked the audience if they're ready to work, and do they "believe in freedom? Opportunity?"

"Are we ready to fight? Yes. When we fight we win." she concluded, before exiting the stage as Beyoncé's Freedom played once again.

Image source, Reuters

Harris says she will make sure "every American has the ability to cast their ballot and it have it counted".

The vice-president says to help keep people safe from "the terror of gun violence" she will pass red flag laws, universal background checks and an assault weapons ban.

Turning to reproductive rights, Harris says she will "stop Donald Trump's extreme abortion bans, because we trust women to make decisions about their own body and not have their government tell them what to do."

"When Congress passes a law to restore reproductive freedoms", Harris says she would sign it into law.

Image source, Reuters

After talking about building up the middle class, Vice-President Kamala Harris says Donald Trump "wants to take our country backward" - referring to the Republican Project 2025 agenda and other policies.

"Can you believe they put that thing in writing?" Harris asks the crowd of the document.

She says Trump wants to cut social security and Medicare, end the Affordable Care Act and will give tax breaks to billionaires and big corporations.

She repeats: "We are not going back" and the crowd chants along with her.

"Ours is a fight for our future, and a fight for freedom," Harris tells the cheering crowd.

Image source, Reuters

Harris says one of her major platform points is that "everyone should not just get by", but should "get ahead".

"A future where no child has to grow up in poverty," she says to applause. "Where every worker has the freedom to join a union. Where every person has affordable healthcare. Has affordable childcare and paid family leave."

Additionally, Harris says that hopes for a future in which senior citizens can "retire with dignity".

"All of this is to say, building up the middle class will be a defining goal of my presidency," she adds.

Image source, Reuters

Harris says this campaign is "about who we fight for".

Continuing her attack on Trump's record, she accuses him of trading access for campaign contributions and promising oil lobbyists "he would do their bidding" for $1bn in campaign donations.

"On other hand, we are running a people-powered campaign," she asserts, to cheers and applause.

"And we just had the best 24 hours of grassroots fundraising in presidential campaign history."

Harris goes on to talk about her role as a prosecutor and attorney general in California before becoming vice-president.

There, she says, she took on "predators who abused women, fraudsters who ripped off consumers, cheaters who broke the rules for their own game."

"So hear me when I say, I know Donald Trump's type," she says.

This is met by more chants of "Kam-a-la" from the audience.

"In this campaign I will proudly put my record against his any day of the week," Harris continues.