Newspaper review: Super-rich 'hit-hard' and EU row rumbles on
"Boris rage at 'ridiculous weird' Obama" is how the Mail on Sunday headlines the latest broadside in the row over the US president's intervention in Britain's EU debate.
"In an outspoken assault, the London mayor mocked the US president's controversial claim that Anglo-US trade would be hit by Brexit," the paper reports.
Mr Johnson tells the paper: "The UK has never been able to do a free trade deal with the US in the last 43 years - because we are in the EU!"
He adds: "Negotiations are held up by absurd problems like the French restrictions on Hollywood movies or Greek hostility to American feta cheese.... It's time to take back control, folks."
The Observer says US presidential hopeful Hillary Clinton has also "thrown her weight" behind the campaign to keep the UK in the EU.
The paper says the former First Lady issued a statement that "makes clear that if she enters the White House, she will want the UK to be fully engaged, and leading the debate, within the EU".
Many of the papers reflect on the impact of Barack Obama's support for the UK remaining in the EU.
In a comment piece, the Mail on Sunday says the president has "electrified" a debate "which until now has been much duller than a geriatric darts match".
"By bluntly pointing out the truth... he has angered the Leave lobby, aided the Remain campaign, but also made everyone think.
"For the first time, millions have been shown in hard detail that this is not a game, but a real choice with real consequences."
The Sunday Times analyses what it sees as Mr Obama's "metaphorical machine-gunning of Johnson, the Brexit campaign's chief cheerleader" in his comments on Friday.
Coming just days after the Treasury's "most significant intervention" so far - a warning of the cost to families of a vote to leave - it capped the Brexit campaign's worst week, the paper says.
However, according to the Sunday Telegraph, Armed Forces Minister Penny Mordaunt has accused Mr Obama of showing "woeful ignorance" of the damage the EU does to UK national security.
She says he has failed to appreciate how European judges and laws on migration undermine trans-Atlantic efforts to tackle terrorism.
The Sun on Sunday reports another voice has entered the debate: "Maggie Thatcher's economics guru stormed into the referendum battle last night, claiming Brexit would cut living costs by £40 a week.
"Professor Patrick Minford accused EU chiefs of imposing over-inflated prices on everything from food to cars."
Window on the wealthy
For nearly three decades the annual Sunday Times rich list has been providing a window on the world of the UK's richest people.
But it's not all good news for the super-rich this year, with the paper reporting that some of them "have suffered the worst hammering of their fortunes since the financial crash".
"Ten people in last year's exclusive ranks of billionaires have fallen out of the top bracket to the level of mere multi-millionaires," it says.
Steel magnate Lakshmi Mittal topped the list in 2008 with £27.7bn, but has lost three-quarters of his wealth since then as a result of the global steel industry crisis.
His family are now worth £7.12bn, the Times reports. "Hardly the breadline, but a long way short of their peak and a £2.08bn loss on last year."
Under the headline "The Rich Lost", the Sun on Sunday offers little sympathy to those billionaires who "could be down to their last yachts".
Among the losses it highlights is the £460m hit taken by Formula One boss Bernie Ecclestone, whose wealth fell because of the sport's dwindling TV audiences, the paper says.
"If he wants to save some cash, then he could always confiscate his daughter's passport - heiress Tamara enjoyed more than a dozen luxury holidays in 2015, including jaunts to Monaco, Dubai and New York," it adds wryly.
The Sunday Express takes a more positive tone as it focuses on the UK's place as home to the third-highest number of billionaires in the world. It has 120 - with a combined wealth of £344bn - behind China (193) and the US (378).
And London can lay claim to having more billionaires than any other city, it adds, with 77 - ahead of New York's 61.
The Sunday Times concludes that the story of this year's rich list - that fortunes can fall as well as rise - is an important one.
"The Mittals... are living proof that what a capitalist economy can give, it can also take away, which is exactly as it should be," it comments.
But it also adds: "The rich list reminds us that for those with energy and drive it is possible to achieve enormous things."
Today the London Marathon, which was first staged in 1981, will see its one-millionth finisher cross the line.
It is just one of a number of statistics highlighted in the papers' pre-race coverage of the event:
- 247,069 people applied for a place this year - a record number
- 39,698 have registered to run today
- 55% of them have never run a marathon
- 300 litres of blue paint mark the route
- 23 water stations for runners
- 1,263 portable loos to deal with the effects
- 200 healthcare workers will be on standby
- 52 first aid stations
- 59 St John ambulance treatment centres
'Thousands face hospital strike chaos'
With junior doctors in England set to stage their first all-out strike on Tuesday and Wednesday, some of the papers reflect on what that means for patients.
"Hospitals were last night making desperate efforts to prepare for the mass walkout," the paper says. "Almost 13,000 operations have been postponed and a further 113,000 appointments cancelled in an attempt to ensure essential services can still run."
The Mail on Sunday says Health Secretary Jeremy Hunt has issued a "dramatic final appeal" to junior doctors to call off their "extreme" strike and meet for talks instead.
The strike is an escalation of the long-running and bitter dispute with the government over a new contract.
Mr Hunt wants extra payments for working Saturdays ended - in return for an average 13.5% basic pay rise - in an attempt to improve staffing levels and cut higher death rates at weekends.
The paper says it has seen a letter from Mr Hunt to the British Medical Association, in which he suggests meeting to discuss concerns, including funding for seven-day services.
But it "contains no suggestion Mr Hunt is willing to discuss the main issue dividing the sides - Saturday pay", the Mail adds.
The Sunday Times reports that the strike could be called off if Mr Hunt agrees to a Labour-brokered proposal to pilot the new contract on weekend working in selected areas, before rolling it out nationwide.
In a comment piece, the paper says this week's walkout - the fifth in the dispute - would be the most destructive so far.
"The health secretary will not want to be seen to be caving in to the BMA, but the proposal should be considered. This damaging dispute needs to be settled."