Newspaper headlines: Party leader battles and England's Euro 2016 'humiliation'
As the prime minister travels to Brussels to meet European Union leaders for the first time since the UK voted to leave the bloc, the race to succeed him comes under the spotlight.
Candidates are jockeying for position after David Cameron's resignation, says the Guardian, with Boris Johnson and Theresa May widely seen as frontrunners.
The i says the former London mayor is on course to become prime minister in nine weeks' time... "unless the Tories can unite over a rival".
"Although Mr Johnson's support is patchy within the parliamentary party, allies are attempting to build unstoppable momentum behind his campaign by urging other potential candidates to step aside," reports the paper.
But as nominations for the Conservative leadership open later, the Times carries news of a YouGov poll of 2,013 Tory voters which suggests Home Secretary Mrs May has overtaken Mr Johnson to become favourite, with 31% support against 24% for her rival.
The result, says the Times, questions the assumption Mr Johnson is the darling of party activists after his campaign for Brexit triumphed in the EU referendum.
According to the Daily Telegraph, a total of nine MPs are expected to begin a "36 hour scramble" to try to amass enough support from backbenchers for a run at the top job.
Writing in the paper, former party leader William Hague says: "There will be several candidates who have the experience, credibility and knowledge to do the job. But the question must be: Do they have the clarity of vision to provide a divided and uncertain country with the confidence it needs."
The Sun says Work and Pensions Secretary Stephen Crabb and Business Secretary Sajid Javid are considering standing on a "dream ticket" representing a new generation of Tory MPs with humble roots to derail Mr Johnson's bid.
One MP who will be absent from the race is Chancellor George Osborne, who says in an article for the Times he is "not the person to provide the unity my party needs" although he is pledging to be "100% focused on providing the economic stability and reassurance Britain needs".
Elsewhere, the turmoil in the Labour Party following the mass resignation of shadow cabinet members over leader Jeremy Corbyn's handling of the EU referendum continues to attract headlines.
Mr Corbyn announced a new shadow cabinet and addressed thousands of supporters in Parliament Square on Monday but had faced a "bruising day", says the Guardian.
In a leading article on its front page, the Mirror says: "The country is in the biggest crisis for decades and so is the Labour Party.... While he is a decent and principled man, it is now clear he is not cut out to unite and lead Labour through these turbulent times and beat the Tories in a snap general election."
Mr Corbyn, says the Financial Times, "is facing the biggest rebellion against a party leader in modern UK history, brutal in its scale and determination".
The Times reports Mr Corbyn's allies are resigned to losing a no-confidence vote in his leadership later but a unifying candidate capable of unseating him is yet to emerge.
In the view of the Daily Express: "While the hunt to find a new leader of the Conservative Party is proceeding in a relatively civilised manner, Labour has finally given vent to the simmering fury and discontent which had dogged Jeremy Corbyn's leadership from day one."
Writing in the Daily Mail, Dominic Sandbrook says Labour faces annihilation if "as seems likely, they go into an early general election as a divided party...
"That, I think, would be a disaster for British politics. Not only do we need a strong and focused opposition, but Britain genuinely needs a sane Labour Party."
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England's 2-1 defeat to Iceland at Euro 2016 is widely described as a "humiliation".
"It's a Brrrexit," says a headline in the Sun as it reports how England's "misfiring millionaires" crashed out at the hands of the tournament's "minnows".
"We have known some disappointments, but this might just beat all," writes the i's chief sports correspondent Kevin Garside.
Manager Roy Hodgson quit minutes after the team suffered one of their greatest defeats in international football to the lowest-ranked side, says Metro.
For the Daily Mail, it is a new low. "Unbeaten in qualification, England have been giving lacklustre displays during the tournament itself," it says.
The Times says the defeat in the last 16 match was "arguably the most embarrassing" in England's 144-year history - although it does point out that the side have never won a knockout tie at the European championship away from home.
For the Daily Mirror it was a grim night at the Stade de Nice which left the manager "looking distraught on the touchline as fans could not believe what they were seeing".
In the Guardian, Daniel Taylor writes: "For Roy Hodgson, it was a desperate and ignominious way to end his four years as England manager.
"Whatever else happened in that time, his period in charge will probably always be remembered for the full-on humiliation that accompanied this defeat and the knowledge it will rank among the more infamous results in the history of the national team."
'Living the dream'
The papers do, however, find room to hail a British sporting success after Marcus Willis pulled off what is being described as one of the biggest upsets at Wimbledon.
Willis had given up on his tennis career and was making plans to move to the US to start a coaching job before his new girlfriend persuaded him to give the sport one last chance, it reports.
The defeat of the Lithuanian Ricardis Berankis, ranked 54th, in straight sets has earned him a second round clash with seven-times champion Roger Federer, says the Daily Mail.
"Willis is living the tennis dream," says the Daily Mirror, noting he has only won £213 in prize money so far this year but is now guaranteed a £50,000 payday.
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