Will he or won't he? Trump mum on accepting election results Republican presidential candidate refuses to say if he will accept outcome at final debate; battle for Mosul intensifies as Isis leaders flee; Europe's Mars probe 'lost' Donald Trump at one point cut off Hillary Clinton with the line: 'Such a nasty woman.' Photograph: Saul Loeb/AFP/Getty Images Edward Helmore Trump on election results: we'll see "I will look at it at the time." These were Donald Trump's words as he refused to say if he will accept the outcome of November's election, stoking conspiracies over the legitimacy of the US democratic process. "That's horrifying," Hillary Clinton replied. "I'm appalled that a nominee of one of our two major parties would take that position." The Republican nominee's refusal to endorse the results of the forthcoming election, unheard of in modern American history, capped a fractious debate in which he clashed with Clinton over abortion, gun rights, immigration and foreign policy. Trump spoke of bad Mexican "hombres" and refused to accept the accounts of nine women who have accused him of sexual misconduct. Clinton taunted her rival, accusing him of being "a puppet" of Russian president Vladimir Putin, while Trump at one point cut her off mid-sentence with the line: "Such a nasty woman." Donald Trump refuses to say if he will accept election result in final debate The madness of Trump For at least an hour on Wednesday night, America peered through a portal into another world, writes Washington bureau chief Dan Roberts. In this alternate reality, a Democrat and Republican debated the once familiar dividing lines of US politics – guns, abortion, tax – in a shockingly conventional style. But nothing is normal about 2016. Nothing can erase the memory of the first two debates, or the past 18 months of demagoguery. The shock, outrage and headlines from Las Vegas will focus on Donald Trump's brazen confirmation that not even the basic rules of the game are ones he accepts. Why the final presidential debate highlights the madness of Trump's ideas So … who won? Guardian opinion writers weigh in Hillary Clinton is almost certain to be the next US president, writes Jill Abramson: "In the final debate, Donald Trump blew his last best chance to present himself as a remotely credible candidate. Clinton now stands on the brink of historic power." Meanwhile, Lucia Graves notes that "Hillary Clinton spoke directly to women" while Christopher R Barron writes that "Trump stuck to the issues and forced Hillary to talk policy". Our readers also reacted, as did young Republicans in New York. We also fact-checked the debate claims in full. Who won the final presidential debate? Support the Guardian's fearless journalism The Guardian is an independent voice in this year's election. That means no bias or corporate owner influencing our coverage. But in-depth political reporting takes a lot of time, money and hard work to produce. If everyone who reads our coverage helps to pay for it, our future will be more secure. Support the Guardian with a monthly payment, or a one-off contribution. Become a Guardian member or contribute to the Guardian. Fight for Mosul intensifies Iraqi special forces have entered the battle to retake Mosul, with a pre-dawn advance on a nearby town held by Islamic State, a key part of a multi-pronged assault on eastern approaches to the besieged city. The addition of the elite troops, also known as counter-terrorism forces, on Thursday marked a significant intensification of the fight for Iraq's second-largest city and comes a day after a US general said Isis leaders had begun to flee Mosul, leaving foreign fighters to face the Iraqi army and Kurdish forces. Iraqi special forces join battle to retake Mosul from Isis European Mars probe 'lost' It traveled millions of miles across the solar system, deployed its parachute flawlessly and survived a scorching descent through the Martian atmosphere, but the European Space Agency has confirmed that its Schiaparelli Mars lander was lost just one minute before it touched down on the surface of the red planet. ESA scientists were left unsure of where the probe is and whether it crash-landed. Mars lander lost signal one minute before landing, ESA confirms Saudi Arabia's bond gamble Saudi Arabia has raised $17.5bn (£14bn) from its first foray into the global bond markets as it seeks to repair the damage to its public finances caused by the collapse in oil prices since 2014. Saudi Arabia – along with other oil-producing countries – was caught unawares by the fall in crude from $115 a barrel in the summer of 2014 to a low of under $30 a barrel at the end of 2015. Now, the desert kingdom hopes to broaden the economy so that it is less dependent on oil. Saudi Arabia raises $17.5bn from bonds to repair damage to public finances The devastating effects of dirty air Air pollution in Africa is causing more premature deaths than unsafe water or childhood malnutrition, and could develop into a health and climate crisis reminiscent of those seen in China and India, a study by a global policy forum has found. The study suggests dirty air could be killing 712,000 people a year prematurely, compared with approximately 542,000 from unsafe water, 275,000 from malnutrition and 391,000 from unsafe sanitation. Air pollution more deadly in Africa than malnutrition or dirty water, study warns Iggy Pop's body Iggy Pop doesn't play an instrument when he performs on stage. "He plays his body," according to artist Jeremy Deller. "The way he manipulates it, damages it, bends it and flaunts it has become his way of communicating. His body interprets the music but it's also playing its own tune." For his latest project, Deller invited 22 artists, from their teens to their 80s, to a life-drawing class to interpret Pop's famous physiognomy. The result, Iggy Pop Life Class, opens at the Brooklyn Museum next month. Raw power: why Iggy Pop posed naked for Jeremy Deller's Life Class In case you missed it ... Comedian Amy Schumer has written an open letter to fans who walked out of her Sunday standup show in Tampa, Florida, after she made jokes about Donald Trump. "I want you to know that I will go straight to a rehab facility that will teach me how to make all people happy. Both the rich, entitled, white people who are gonna vote for him and the very poor people – who've been tricked into it." She closed referencing her controversial joke that called the Republican candidate an "orange, sexual-assaulting, fake-college-starting monster". Amy Schumer pens open letter to fans who left Florida show after Trump jokes Manage your emails | Unsubscribe | Trouble viewing? You are receiving this email because you are a subscriber to Guardian US Briefing. Guardian News & Media Limited - a member of Guardian Media Group PLC. Registered Office: 222 Broadway, 22nd and 23rd Floors, New York, New York, 10038