Natalie Elphicke, the MP for Dover and Deal, defects from the Conservatives to Labour as Prime Minister's Questions begins in the Commons
"Under Rishi Sunak, the Conservatives have become a byword for incompetence and division," she says in a statement released at midday
"From small boats to biosecurity, Rishi Sunak’s government is failing to keep our borders safe and secure," she adds
In the Commons, Starmer asks Sunak: "What's the point of this failed government staggering on?"
But the Conservatives have highlighted past comments from Elphicke - including an article she wrote headlined "don't trust Labour on immigration"
"Even Labour MPs know you can't trust Labour to stop the boats," the Conservatives say on X
Starmer then attacks the PM for having not yet called a general election.
If Sunak really thinks the public "believes the nonsense that he spouts", why doesn't he put it to the test and call a general election, Starmer asks.
Sunak's government must call a general election by January next year.
Sunak says since he became prime minister small boat crossings "are down by a third".
The prime minister says that's due to a number of factors, including the deportation of 20,000 people and the processing of more claims.
"When it comes to border control, there's a crucial difference between us. We want secure borders, he is happy with open borders," Sunak says.
Starmer quips that Sunak is getting ahead of himself in asking the Labour leader questions, setting off raucous shouts across the chamber.
Once calm is restored, Starmer says there have been 2,400 small boat crossings in the past 16 days, and puts it to Sunak that the government's plan is not a deterrence, but an amnesty.
Sunak goes on to joke, saying he was surprised to see Starmer in North Yorkshire, but probably not as surprised as he was to realise he could not get the tube there.
Sunak says the people of North Yorkshire "believe in hard work, secure border, lower taxes and straight talking common sense".
Adding: "They're not going to get none of that from a virtue signalling lawyer from north London."
Image source, UK ParliamentStarmer is up again, with some jabs at Sunak's multiple properties and disappointing results in the local elections, as the prime minister himself described it.
Starmer says Sunak can go to the various places he calls home across the country and enjoy the fruits of his success on Thursday night.
Is the prime minister in a hurry to get back to California, Starmer asks - a reference to the penthouse property the Sunak family owns in the US state.
Image source, UK ParliamentSunak replies that this time last year he reminded Starmer he can be as cocky as he likes about the local elections, but when it comes to national elections it is policy that counts.
The PM takes a swipe at Starmer, asking what has Labour achieved, and points to its deputy leader under investigation and several U-turns in Labour policies.
Starmer references Labour's recent local election victories, saying the Tories have faced several high profile losses over the past months.
"How many more times do the public and his own MPs need to reject him before he takes the hint?" Starmer asks.
Starmer's comments follow the local elections last week, which saw Labour gain more than 180 council seats, while the Tories lost more than 470 - just under half of the seats it was defending.
Starmer asks when Sunak will get 'hint' over Tory losses
Prime Minister Rishi Sunak joins Starmer in welcoming new MPs.
Sunak says he hopes his new councillors make Starmer as proud as his make him.
"Great leaders like Andy Street," Sunak adds, saying the departed West Midlands mayor leaves behind a strong legacy.
Street, who held the role of West Midlands mayor for seven years, lost by just 1,508 votes to Labour's Richard Parker on Saturday in the mayoral elections.
Henry Zeffman
Chief political correspondent
There were genuine looks of bafflement on the Conservative benches when Sir Keir Starmer heralded Natalie Elphicke’s defection.
Most of them seemed not to have noticed that she had crossed the floor and was sitting directly behind the Labour shadow cabinet.
Labour Leader Sir Keir Starmer opens with a welcome to his new MP - Natalie Elphicke, who announced moments ago she was switching parties.
He asks the prime minister: "What's the point of this failed government staggering on?"
Starmer quizzes PM on two Tory MPs defecting to Labour
Chris Mason
Political editor
Blimey, another one.
Another Conservative MP has defected to Labour.
This time it is Natalie Elphicke, just as PMQs starts - timed for maximum political impact.
And listen to her words: "The elected Prime Minister was ousted in a coup led by the unelected Rishi Sunak. Under Rishi Sunak, the Conservatives have become a byword for incompetence and division."
Image source, UK Parliament/PAWe can bring you more now from Natalie Elphicke, who has just announced her move to Labour.
In a statement, she hit out at the "broken promises of Rishi Sunak's tired and chaotic government".
The Dover MP crossed the floor in the Commons just moments before Prime Minister's Questions.
She said: "I have carefully considered this decision. The change has been dramatic and cannot be ignored.
"For me key deciding factors have been housing and the safety and security of our borders."
Her resignation comes less than two weeks after MP Dan Poulter defected to Labour.
Conservative MP Natalie Elphicke has decided to join Labour, it has just been announced.
Rishi Sunak begins by paying tribute to John Swinney on becoming SNP leader and Scottish first minister.
He says he looks forward to working with him constructively.
Image source, UK ParliamentThe prime minister is now standing at the dispatch box, which means proceedings are about to begin.
Stay with us as we bring you the latest developments, as well as political analysis from our colleagues at Westminster.
We're poised to bring you all the latest from PMQs when it starts in the next few minutes.
As a reminder, you can also watch live by pressing the large Play button at the top of this page.
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Image source, ReutersThe prime minister has just left Downing Street and is making his way to the House of Commons.
PMQs will kick off at 12:00 BST, so stay tuned as we'll be bringing you the latest from the Commons here.
Daniel Wainwright
Data journalist
Labour continues to have a lead of about 19 percentage points over the Conservatives, according to opinion polling.
If a general election were held tomorrow, about 43% of people in Great Britain would vote for Labour compared to 24% for the Conservatives.
This is once people who don’t know or say they won’t vote are excluded.
Our latest averages come from polls by nine different polling companies conducted in the two weeks up to 7 May.
That means some of the polls were taken before last week’s local elections and some afterwards.
You can use our interactive poll tracker to see how different parties have been doing at different points over the past few years.
Image source, .Chris Mason
Political editor
Hello from the press gallery.
This is the first time the prime minister has faced the Commons since those grim election results for him last week.
But those on his own side who wanted rid of him have accepted defeat, they’re not going to turf him out before the election.
We can expect some jubilation from Labour, but that said, Labour faced some tough questions from us reporters after PMQs last week on their approach to small boat crossings and asylum seekers.
The government has some tough questions to answer on that too – their Rwanda scheme that they are now trying to make happen.
Let’s see where the questioning takes us this week.