Kamala Harris and her new running mate Tim Walz have made their first campaign appearance together at a rally in Philadelphia
Harris praised Walz's record as Minnesota governor - "I set out to find a partner to help build this brighter future," she said
Walz touted his small-town upbringing and career as a teacher, before attacking his Republican opponents Donald Trump and JD Vance
Harris announced Walz as her vice-presidential pick this morning, and the pair are kicking-off a tour of key battleground states
You can watch the rally live by clicking the button at the top of this page
Walz will become vice-president if Harris beats Trump in November
He gained national attention for his strategy of calling Trump and Vance "weird", a phrase Harris has adopted when talking about her rival
Vance, Trump's running mate, has called Walz a "far-left radical" and said he would debate his opponent when he is "officially the nominee"
Walz on Republicans: 'Creepy and weird as hell'
While many US outlets have reported Harris' selection of Walz, Harris has not made the announcement official.
All morning the Harris campaign has been insisting that she hasn't made the call to her vice-presidential pick yet.
We're expecting that official statement soon. At which point, we expect an avalanche of reaction from party leaders and former presidents.
Stick with us for the latest.
Katty Kay
US special correspondent
In my 25 years covering US politics, the only time a VP pick has made a clear difference to the final election result was in 2008 when Sarah Palin dragged down John McCain’s ticket.
Walz has strategic value: Democratic governors like him (that helps with money and campaigning), he comes from the Midwest, and his army background helps with white, rural voters.
But this appears as much a pick about personality as politics.
He is known for being cheerful and optimistic (check out his fun, quirky social media posts) and, in the end, politics is as much about people as anything.
If the two candidates get on well, that will matter - especially when times get tough on the campaign trail.
Image source, Getty ImagesTim Walz is Kamala Harris' vice-presidential pick - though she has not made a formal announcement.
So who is he?
Before being elected as Minnesota's governor in 2018, Walz was known as a battle-tested Democrat who served 12 years in Congress.
He has gained national attention for his strategy of calling Donald Trump and JD Vance "weird".
The phrase caught on with a number of Democrats - including Harris.
"He's just a strange, weird dude," Walz said of Trump during a fundraising event.
His plainspoken and small-town Midwestern persona could appeal to independent and conservative voters.
The 60-year-old led Minnesota through the 2020 protests over George Floyd's death in Minneapolis.
He deployed the National Guard to help quell riots that broke out during the demonstrations.
Mr Walz served more than 20 years in the Army National Guard, taught high school and also worked as an assistant football coach.
Minnesota is arguably less of a swing state, but would be a valuable asset for Harris.
Anthony Zurcher
BBC North America correspondent
Image source, Getty ImagesFew people had Minnesota Governor Tim Walz on their early lists of possible Kamala Harris vice-presidential picks, but US media now reports that he will be on the Democratic ticket.
The former high-school teacher and football coach won attention among Democrats for his affable style and ability to land rhetorical blows on Donald Trump without seeming too aggressive.
The “weird” label he applied to the former president and his running mate became a Democratic mantra in just a matter of days - and it is now a standard part of Harris’s stump speech.
While Minnesota isn’t a battleground state, the Harris campaign may hope that Walz has mid-western cross-border appeal in places like Wisconsin and Michigan, which will help decide this election.
Walz also has a record of enacting progressive legislation in his state while defending it in a way that moderates and independent voters can understand. In his prior job as a congressman, he was able to win in a district that has a significant number of rural and Republican voters.
The governor may not have been a household name among Democrats a few weeks ago, but sometimes the dark horse wins the race.
Kamala Harris has picked Tim Walz, the governor of Minnesota, as her running mate in the US presidential election, US media have reported.
This is breaking news, stick with us as we bring you the latest updates and analysis.
Bernd Debusmann Jr
Reporting from the White House
Image source, Bernd Debusmann Jr / BBCGood morning from the White House, where Joe Biden is - at least publicly - having a relatively quiet day while Americans anxiously wait to hear on Kamala Harris' vice-presidential pick.
At 14:15 EDT (15:15 BST), Biden is scheduled to receive the President's Daily Brief, a highly classified briefing on national security issues. That's not unusual - he gets it several times a week, at least.
Half an hour later, Press Secretary Karine Jean-Pierre will deliver a press briefing to the White House press corps, where she is almost certainly going to get questions about Harris' pick.
The president has no public events scheduled today.
That could, however, change quickly depending on today's events, particularly any potential escalation of tensions in the Middle East.
Image source, Getty ImagesHarris and her running mate will immediately dive into a tour of swing states over the course of the next week to make their case to American voters.
And JD Vance is following them.
The Republican vice-presidential candidate is planning to trail the Democratic ticket to a series of battleground states.
Tuesday night Harris and her VP will make their debut at a Philadelphia rally. Earlier in the day, Vance will also be speaking in Philly.
On Wednesday, Vance will follow Harris to Detroit, and Eau Claire, Wisconsin.
Both Harris and Vance had also been planning to go to Raleigh, North Carolina later this week. However, flooding caused by Tropical Storm Debby means this is no longer likely.
As of last night, Kamala Harris had not made a final decision on who will be her running-mate, a source familiar with the process told CBS News, the BBC's US partner.
She reportedly wanted to sleep on the decision one last time.
Harris' team have apparently printed multiple versions of campaign signs for tonight's rally in Philadelphia. The signs show her name alongside the names of some of her top contenders, the source told CBS News.
Harris is expected to call all of the contenders today to inform them of her decision, before it is officially announced.
While Vice-President Kamala Harris has been campaigning since Joe Biden stepped down from the race for the White House, she only officially secured the Democratic nomination for president on Monday.
Over a multi-day vote of party delegates, Harris secured enough support to become the first woman of colour to win a major party nomination.
The pledging of delegate support comes just weeks before the party will gather at the Democratic National Convention in Chicago.
Anthony Zurcher
BBC North America correspondent
Image source, Getty ImagesWith Joe Biden stepping down from his campaign and endorsing Kamala Harris, Democrats have had a jolt of energy.
All of Harris’s leading potential rivals for the nomination have endorsed her, as has former Speaker of the House Nancy Pelosi – who remains one of the most influential players in Democratic politics - and former president Barack Obama.
This is, still, shaping up to be a tight race in November - a condition that reflects deep partisan trenches in American politics and the distaste many voters have for Donald Trump as a candidate.
The vice-president’s primary challenge – and opportunity - will be to capitalise on this Trump aversion, attract centrist voters in key swing states and energise the Democratic base to match the enthusiasm many on the right hold for the former president.
Image source, Getty ImagesMight today's annoucement move the polls?
The latest data from CBS, the BBC's partner in the US,, external suggests Kamala Harris v Donald Trump is currently too close to call.
Nationally, Harris holds a one-point lead. Across battleground states, it's level.
Trump enjoys a small lead in a few states - Wisconsin, Georgia and North Carolina - but the race has tightened since Joe Biden bowed out.
Image source, ReutersTim Walz, who was one of those interviewed by Kamala Harris this weekend
Harris's decision - expected to be announced this morning - comes after she interviewed several contenders over the weekend.
Among those to be grilled were governors Josh Shapiro and Tim Walz, and Senator Mark Kelly.
Harris also reportedly met her vetting team - led by former US attorney general Eric Holder - over the weekend and received in-depth presentations on their findings, including potential political vulnerabilities.
(Read Jude Sheerin's take on the painful-sounding vetting process here).
Harris also met another top contender, Transportation Secretary Pete Buttigieg, on Friday - and met several other candidates virtually, US media report.
Image source, ReutersKamala Harris and Josh Shapiro, pictured last month
The search for a running mate has reportedly narrowed down to two.
Josh Shapiro, Pennsylvania governor: Shapiro has seen high approval ratings since he was elected in 2022 and could help Harris capture Pennsylvania - a must-win state in the race for the White House.
He would be the first Jewish vice-president if chosen, and if Harris then wins in November.
Tim Walz, Minnesota governor: Walz, who served 12 years in Congress before becoming governor of Minnesota in 2019, gained national attention for his strategy calling Donald Trump and JD Vance "weird".
The 60-year-old led Minnesota through the 2020 protests over George Floyd's death in Minneapolis.
But there are other names in the mix: Arizona Senator Mark Kelly, Kentucky Governor Andy Beshear, and Transportation Secretary Pete Buttigieg.
Jude Sheerin
Reporting from Washington
Presidential campaigns put their potential vice-presidential picks through a gruelling vetting process before they can join the ticket - one past participant likens it to "a colonoscopy".
Have you ever paid for sex?
Have you ever paid for an abortion?
Have you ever had a homosexual encounter?
Those are just some of the questions VP hopefuls might face.
The vetters pore over a contender’s tax returns and medical history. They may log on to his or her private social media accounts. They even scour the social media posts of his or her children and grandchildren.
Evan Bayh, a finalist to become Barack Obama’s running mate in 2008, remembers the procedure took nearly three months and was "like having a colonoscopy performed with a telescope".
"There was a whole team assigned to me: an accountant, a lawyer, a physician," the former Indiana senator and governor told the BBC.
The head of the vetting team phoned one day to ask Bayh about a false internet rumour that he had once received psychiatric treatment.
"And I said, ‘No, it's not true. But if you guys don't hurry up and make a decision, it might be true.'"
Image source, Getty ImagesEvan Bayh, pictured in 2010
Image source, Getty ImagesHello and welcome to our live coverage of what could be a big day in the US presidential race.
At some point today, we are expecting to find out who Kamala Harris has chosen as her running mate for Novermber's election. (As a reminder, the running mate would become vice-president if Harris beats Donald Trump).
Harris has reportedly narrowed her search down to two names: Pennsylvania Governor Josh Shapiro and Minnesota Governor Tim Walz.
But it could also be one of the other names that have been floating around the Washington DC rumour mills for weeks - like Kentucky Governor Andy Beshear, or Arizona Senator Mark Kelly.
What we do know is that the winner of the Democratic Party’s "veepstakes" is expected to appear alongside Harris at a rally in Philadelphia later today.
On the Republican side of things, JD Vance is also going to be in Philadelphia today to give a speech. Vance, remember, is Donald Trump’s running mate.