Image source, PA Media

If you're just joining us, here's a round up of the latest developments in the contest to become the next Conservative Party leader and prime minister.

• The deadline to enter the contest closes at 2pm on Monday and so far Commons leader Penny Mordaunt is the only person to officially declare they are in the race. Candidates require the support of 100 MPs. The BBC's tally indicates that Rishi Sunak has already received the backing of at least 128 MPs and Boris Johnson has 53 supporters, compared with Ms Mordaunt's 23
• While neither Sunak or Johnson have publicly declared they will be candidates to replace Liz Truss, the BBC has been told the pair held a meeting last night. However, their camps have not disclosed what they discussed
• The leadership race dominates the majority of papers today - with the Sunday Times reporting that Sunak is forging ahead, as support for Boris Johnson appeared to stall. In an article for the paper, Kemi Badenoch - the first member of the cabinet to publicly endorse Sunak, said "We are not a fan club or organising a popularity contest". Meanwhile, the Observer says that senior Tories were engaged in a frantic campaign to stop Boris Johnson staging a dramatic return to Downing Street, with claims he would cause further economic damage and risk "the end of the Conservative party"
• We will hear from Mordaunt, when she appears on Sunday with Laura Kuenssberg on BBC One at 9am. Labour leader Sir Keir Starmer, who has been calling for a general election, is another guest on the show

Reality Check

Image source, UK Parliament/Jessica Taylor

Boris Johnson is currently being investigated by a Commons committee over whether he misled MPs when talking about parties in Downing Street.

The Privileges Committee plans to start taking evidence in public sessions before the end of November.

Johnson, who has already been fined by police for breaking his own Covid rules, could face suspension from the House of Commons or even lose his seat, if the committee finds he was in contempt of Parliament.

The BBC’s Reality Check has detailed three occasions where Johnson spoke in the Commons about lockdown parties.

Image source, Getty Images

Many Conservative MPs have been going public with who they are backing to become the UK's next prime minister.

So far 204 out of 357 have said who they're supporting. We've been keeping a tally, and here's where we're at:

• Rishi Sunak - 128 MPs
• Boris Johnson - 53 MPs
• Penny Mordaunt - 23 MPs

Many others may not declare who they are backing, and more could announce their decisions today - so expect the numbers to continue to change rapidly.

We are only including MPs who have told the BBC on the record who they are backing, or MPs who have publicly declared their support.

Candidates will require the support of at least 100 Tory MPs to be on the ballot.

Image source, Reuters

As we've mentioned, Boris Johnson and Rishi Sunak held talks on Saturday.

Two separate sources told the BBC the meeting took place, but neither camp has disclosed what they discussed.

The BBC's Laura Kuenssberg said in the evening that the pair had met, but she was not sure "if any conclusions or news was likely to come out of it tonight".

Sunak continues to forge ahead in the race, gathering the support of 128 MPs from all wings of his party, including former Johnson allies, while the former PM is in second place with 53 backers, according to the BBC's tally.

The voting intentions of only 204 out of 357 Conservative MPs are currently known and have been verified by the BBC, leaving many still to declare their interest.

The hopefuls have until 14:00 tomorrow to get enough support to run, qualifying them for the next stage of the race.

The growing list of Conservative MPs declaring support for their favourite candidate shows how many have changed their minds since the summer.

There was shock in Westminster after Caroline Johnson pledged her support to Boris Johnson - just months after resigning as vice-chair of the party and calling for him to resign.

And former chancellor Sajid Javid has decided to support Rishi Sunak, after backing Liz Truss during the last leadership election.

Sunak has picked up backing from all wings of his party, including the right, and from figures like Johnson's former Chief of Staff Steve Barclay, his former Brexit Minister Lord Frost and Kemi Badenoch, the International Trade Secretary.

He also has the support of Security Minister Tom Tugendhat and former deputy prime minister Dominic Raab.

Image source, Reuters

Johnson has so far won the support of six Cabinet ministers: Ben Wallace, Jacob Rees-Mogg, Simon Clarke, Chris Heaton-Harris, Alok Sharma and Anne-Marie Trevelyan.

Also supporting the former PM is former home secretary Priti Patel who said he could bring together a united team and lead the UK to a stronger and more prosperous future.

Meanwhile, an ally of former home secretary Suella Braverman told the PA news agency she had been "heavily courted" by both Johnson and Sunak and was likely to decide who to back on Sunday.

Andrea Leadsom, former business secretary, said Penny Mordaunt was the unifying candidate; an experienced minister and a "robust Brexiteer".

Inevitably, the Tory leadership race dominates.

The Sunday Times reports that Rishi Sunak is forging ahead in the Tory leadership race, winning the backing of leading figures of the party as support for Boris Johnson appeared to stall.

Boris Johnson and Rishi Sunak were last night locked in talks to see if they can strike a deal to crown one as prime minister, the Sun reports.

The Observer says that senior Tories were last night engaged in a frantic campaign to stop Boris Johnson staging a dramatic return to Downing Street, with claims he would cause further economic damage and risk "the end of the Conservative party".

Here are the front pages:

Image source, Reuters

Here's a reminder of what happened yesterday in the contest to replace Liz Truss as prime minister.

• Rishi Sunak and Boris Johnson are the two frontrunners in the leadership race but neither have officially declared they are running
• Johnson returned to the UK from the Caribbean on Saturday morning, and got straight to work trying to shore up support
• He and Sunak held talks last night as they edge closer to Monday's deadline for nominations but neither camp disclosed what they discussed
• Johnson's campaign claims he has the support of 100 MPs - the number required to officially enter the race - but Sunak's supporters raised doubts over this and called for the former PM to show proof
• Johnson is in second place with 53 backers, according to the BBC's tally, while Sunak has the support of 128 MPs
• Penny Mordaunt is the only candidate to officially declare she's running, but she lags behind on support with 23 MPs
• Sunak picked up backing from all wings of his party, including the right, and from figures like Johnson's former Chief of Staff Steve Barclay, his former Brexit Minister Lord Frost and Kemi Badenoch, the International Trade Secretary

Sunday's political programmes often get things off to a flying start. And at 9am, Laura Kuenssberg will be hearing from Penny Mordaunt, among others. Join us on this page, as we take you through what comes out of her show.

Of course, we'll be keeping our eye on other TV and radio stations to see if anyone gives anything away, and we'll let you know if they do.

We'll also be keeping our tally of who's supporting which candidate up to date. You can see our working here.

And after Sunak and Johnson held talks last night, we'll be watching to see if either camp has anything to tell us about what they discussed.

Stick with us as we guide you through this expediated race to find a new prime minister.

Image source, Getty Images

It’s the day before Conservative MPs choose which of their colleagues they think are best placed to lead the party - and the country - following Liz Truss’ resignation 45 days into the job of being prime minister.

As part of an accelerated leadership election timetable, nominations close at 14:00 tomorrow.

With each candidate needing to get the backing of at least 100 Tory MPs to be on the ballot, and there are a total of 357 of them in the Commons, only three are expected to get through.

At the moment it’s looking like the contenders will be former Chancellor Rishi Sunak, Commons leader Penny Mordaunt, and possibly, in an extraordinary comeback, ex-Prime Minister Boris Johnson - whose resignation in July led to Truss’ ill-fated tenure in No 10 Downing Street.

Mordaunt is one of the guests on Sunday with Laura Kuenssberg this morning from 09:00.

Stay here as we carry the programme live on this page and bring you the top news lines, best quotes, video clips, analysis and reaction.