Trump's VP pick JD Vance addresses Republican National Convention as Biden tests positive for COVID — as it happened

This is where we'll leave our live coverage of the third day of the Republican National Convention.

Here's a quick recap of today:

• Joe Biden said he would drop out of the presidential race if advised to by a doctor
• Vice President Kamala Harris broke her silence on the attempted assassination of Donald Trump
• The US House of Representatives will set up a bipartisan taskforce to investigate the attack on Trump
• Biden tested positive for COVID-19 and pulled out of a scheduled appearance
• Republican vice presidential candidate JD Vance delivered his first speech since he was chosen as Trump's running mate

You can take a look back at all the developments below, or download the ABC News app and subscribe to our range of news alerts for the latest updates.

While conventions these days act more as rallying opportunities, that hasn't always been the case. 

Until the 1970s, the Republican and Democratic National Conventions were a genuine political process.

We heard from Donald Trump Jr's teenage daughter earlier in the night.

The 17-year-old is Donald Trump's eldest granddaughter and an avid golfer, who frequently shares footage of herself on the green.

According to the Golf Handicap Information Network, she has an impressive handicap of 0.5.

That makes her a considerably better golfer than her grandfather, who claims to have a handicap of 2.8.

Russia's top diplomat is welcoming Republican vice-presidential nominee JD Vance's support for ending US aid to Ukraine and says Moscow will work with any American leader "willing to engage in equitable, mutually respectful dialogue".

Foreign Minister Sergey Lavrov told a UN news conference Vance is in favor of peace and "that's what we need — to stop pumping Ukraine full of weapons".

"Then, the war will end and then we can look for solutions," he said.

Vance wants the US to attend to its own problems — even though he has said Putin was wrong to invade.

That view dovetails with presidential nominee Donald Trump, who has claimed that if elected, he would end the conflict before Inauguration Day in January, though he has declined to say how.

The Russian minister stressed any solution in Ukraine must take into consideration both the situation on the ground and the reality of political life.

Reporting by AP

Late in the evening Joe Biden stepped off Air Force One in his home state of Delaware.

He’s come back after testing positive for COVID, but there's not likely to be much rest from the pressure for him to reconsider his decision to remain in the race.

Adam Schiff is the public blow to the President today, but behind the scenes the backgrounding is in full swing.

Let’s just take you through a few of the latest reports that major US media are attributing to sources speaking on condition of anonymity.

ABC America said the Senate majority leader Chuck Schumer had told the President it would be better if he bowed out.

Schumer did not explicitly deny this, a spokesman saying merely it was “idle speculation”.

The Washington Post reported that Chuck Schumer and the most senior Democrat in the House Hakeem Jeffries had told Biden in separate meetings that if he continued his candidacy it would hamper the party’s chances in the House and Senate in elections also taking place in November.

The New York Times reported that Joe Biden was at least receptive to hearing arguments about why he might drop out of the race.

And CNN reports that senior Democrat and former speaker Nancy Pelosi has told the President the polls show he can’t win.

Joe Biden could easily dismiss this kind of reporting, saying show me someone on the record, but the onslaught of leaks weakens him and suggests the tide could be turning. 

Former Trump defence official Elbridge A Colby says JD Vance expects Europeans to take "the bulk of the responsibility for supporting Ukraine".

Speaking with ABC News Breakfast co-host Michael Rowland, Colby said the Trump-Vance platform isn't about isolationism, but putting American interests first.

Before he was diagnosed with COVID, President Joe Biden sat down for an interview with Black Entertainment Television (BET).

Bits of the interview were released earlier, including him saying he'd only leave the race if he received medical advice to do so.

The full sit-down has since gone to air. 

Unfortunately for the President, it wasn't a commanding performance and there were notable stumbles in what was a fairly non-confrontational interview.

At one point he wanted to focus on how he'd managed to lower prescription drug prices, which he thinks is particularly relevant for the Black community.

But what came out was: "All the folks in the Black community have prescription drug problems."

Then, realising he'd misspoken, he tried to explain. 

The garbled follow seemed to be: "They're a lot of money. You have diabetes, you have, you know, you need insulin."

It had echoes of his woeful debate performance.

At one point the interviewer gave him a softball question about why Black America should vote Biden.

This should have been a home run. He should have been able to rattle off a succinct list of his policies.

He started with:

"Because they know where my heart is. They know where my head is."

But then, instead of marketing himself and his presidency, he decided to argue that it didn't matter if the polls were bad because young people aren't yet paying attention. 

"By the way, if you notice, whether it's young Blacks or young whites or young Hispanics or young Asian Americans, they've never focused until after Labor Day."

Given his recent diagnosis, it will be Biden's last in-person interview for a while.

The series of sit-downs he's recently engaged in were supposed to restore confidence in his mental acuity after his woeful debate.  This outing won't have helped.

Before Trump arrived at the convention, his VIP box wasn't going to waste.

Among the notable people spotted was model and rapper Amber Rose, as well as some of his more vocal supporters like Representatives Monica De La Cruz, Lauren Boebert, Nancy Mace and Vivek Ramaswamy.

JD Vance has just wrapped his first speech since being nominated as the Republican Party's vice presidential candidate.

Planet America host John Barron says the contents would have "delighted" Trump and the former president's campaign.

With JD Vance's speech finished, the Republicans have called time on the third day of the convention.

It's almost 11pm in Milwaukee.

Donald Trump will make his first address since the attempted assassination tomorrow.

This is a huge step up for JD Vance.

From freshman Senator to VP candidate in the space of a few days.

The 39 year-old seemed a little nervous.

A couple of times he tried to begin speaking again before waiting for the applause to settle.

Once he confused the words he was reading from the teleprompter.

He found momentum at times, but it felt on the whole a little underwhelming as a performance.

The campaign has rejected an offer by Kamala Harris to debate JD Vance, saying they can’t accept because they don’t know who the Democratic Vice-Presidential nominee will be.

The implication being that Joe Biden will no longer be in the race.

It’s a clever way of saying no, but I can’t help thinking maybe JD Vance is not quite ready for Kamala Harris.

The Vice-President has low popularity ratings, but she’s been in the political arena a lot longer than JD Vance and would likely be a formidable opponent.

Perhaps the tone of JD Vance’s speech will be less important than the messaging around his hillbilly backstory.

One of the most powerful moments of the speech was when he called out to his Mum in the audience, who has struggled with addiction, but who he said was “10 years clean and sober.”

There's been another break in Vance's speech as the crowd applauds his mother in the VIP box, chanting "JD's mum!".

Vance has spoken about being raised by his grandparents while his mother struggled with a drug addiction.

"Our movement is about single mums like mine, who struggled with money and addiction but never gave up.

"I'm proud to say tonight that my mum is here, 10 years clean and sober. I love you mum."

The vice presidential candidate noted she will "officially" be 10 years clean in January, 2025.

"And if President Trump's ok with it, let's have the celebration in the White House."

Trump was smiling after that line.

In his first official speech to the party faithful, JD Vance says the Republican party of the next four years will be "united in our love for this country and committed to free speech and the open exchange of ideas."

Vance's speech was briefly paused by a standing ovation when he formally accepted his nomination as the Republican Party's vice-presidential candidate.

He's continuing his address with a run-through on "career politician" Joe Biden's political record.

"We need a leader who will stand up for American companies."

The vice-presidential candidate has touched on recent calls by Donald Trump for unity.

"I want to respond to his call for unity myself. 

"We have a big tent in this party on everything from national security to economic policy.

"But my message to you, my fellow Republicans, is we love this country and we are united to win."

Vance says the Republican Party of the next four years will be "united in our love for this country and committed to free speech and the open exchange of ideas".

A video just played at the convention, introducing JD Vance, that gives us some insights into the messaging we’re likely to see from his vice-presidential campaign.

It chartered his personal story, outlined in his best-selling book, from growing up in poverty in a family affected by addiction to later entering the US Senate.

“Only in America is this story possible,” the voice over said, framing Vance as someone who’d achieved the American dream and could relate to people doing it tough.

In an election where the cost of living will be a huge issue, Republicans are likely hoping Vance will come across as someone who personally understands those pressures - perhaps more than Donald Trump.

Republican vice-presidential nominee JD Vance is making his first address since he was chosen as Donald Trump's running mate.

The Ohio-born politician was met with chants of "JD" from the crowd as he walked out.

"Tonight is a night of hope, a celebration of what America once was, and with God's grace, what it soon will be once again," he started.

He's now reflecting on the attempted assassination of Trump.

Usha Vance is on stage introducing her husband, but admits that's a hard task when he's already written a memoir that's been turned into a film by Ron Howard.

She talks about how the pair met at law school and were friends first because "everyone wanted to be friends with JD."

As they grew closer, she says JD "approached our differences with curiosity and enthusiasm.

"The same JD I knew then, is the JD you see now."

A huge cheer just went up inside the convention when the screen behind Don Jr displayed that now famous photo of Donald Trump with his fist in the air, shortly after being shot at.

People in the crowd started chanting "fight, fight, fight", the words uttered by Trump in the immediate aftermath of the assassination attempt that have since become a rallying cry for Republicans.

Don Jr told the crowd they would fight, with their voices, their ideas and their votes.