Temperatures in parts of the US could drop to about -30C as Donald Trump urged voters in one state to brave the blizzard conditions.
At least four people have died in a dangerous Arctic blast, which has knocked out electricity for hundreds of thousands of people, brought snow even to southern states and postponed a key NFL match.
Wind chills in Montana and the Dakotas have felt as low as -57C, while temperatures could be 20-40 degrees lower than normal in large parts of the country between Idaho and Ohio.
“To highlight just how intense this outbreak of Arctic air is, over 95 million citizens fall within a Wind Chill Warning, Advisory, or Watch,” the US National Weather Service (NWS) said.
In Iowa, where it could feel as cold as -40C in the wind, the blizzard forced a pause in campaigning events as Republicans prepare for the party’s first nominating contest on Monday.
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0:58
Will cold deter Iowa caucus voters?
But Mr Trump – the runaway favourite to win the Republican nomination – told supporters “you can’t sit at home” and that voting would be “worth it”, even as piles of snow cover campaign banners and cars were left abandoned.
“If you’re sick as a dog, you say, ‘darling, even if you vote and then pass away, it’s worth it’,” he said, making up a conversation between partners and joking voters may even meet their future spouse.
“Remember, if you’re sick, if you’re just so sick, you can’t, ‘darling, I don’t think’… get up.”
Image: Donald Trump urged voters to head out in the conditions
Image: A sign for Donald Trump covered in the snow
In such extreme conditions, frostbite can take just minutes to set in.
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The weather forced the NFL to postpone the Pittsburgh Steelers versus Buffalo Bills playoff game hosted in bone-chilling Buffalo, New York, where at least two feet of snow has fallen.
Image: Highmark Stadium, where the NFL match had been due to kick off. Pic: AP
Image: Icy conditions affected a worker’s beard as he tried to clear snow from the stadium. Pic: AP
Snow, sleet and freezing rain could hit Texas, Arkansas, Louisiana and the Southern Appalachians early this week, with even Atlanta experiencing -10C by Wednesday.
The extreme weather is a reminder of the February 2021 freeze that left millions in Texas and other central states without power, water and heat for days.
Image: Snowy conditions in Portland, Oregon. Pic: AP
The Texas power grid operator, ERCOT, appealed to the public on Sunday to conserve electricity amid “record-breaking demand”.
Meanwhile, Maine, in the northeast of the country, saw historic flooding up and down the entire coast, with floods in Portland Harbor reaching 14.57 feet and sweeping away small buildings.
Mr Biden was diagnosed on Friday, with tests revealing the cancer had spread to his bones.
The former president posted an image of himself and his wife Jill on X on Monday and wrote: “Cancer touches us all. Like so many of you, Jill and I have learned that we are strongest in the broken places. Thank you for lifting us up with love and support.”
Image: The King and Joe Biden at Windsor Castle in July 2023. Pic: Reuters
The King’s letter comes after British Prime Minister Sir Keir Starmer said he was “very sorry to hear President Biden has prostate cancer”.
“All the very best to Joe, his wife Jill and their family, and wishing the President swift and successful treatment,” he added.
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Meanwhile US President Donald Trump said he was “saddened” by the news, adding: “We extend our warmest and best wishes to Jill and the family, and we wish Joe a fast and successful recovery.”
Former US president Barack Obama said: “Michelle and I are thinking of the entire Biden family.
“Nobody has done more to find breakthrough treatments for cancer in all its forms than Joe, and I am certain he will fight this challenge with his trademark resolve and grace. We pray for a fast and full recovery.”
Image: Barack Obama (right) with Joe Biden at a campaign event in 2022. File pic: Reuters
After a poor debate performance against Mr Trump and amid escalating concerns around his age and fitness to serve, Mr Biden withdrew from the 2024 presidential election race and endorsed his vice president Kamala Harris.
Ms Harris wrote on X after his diagnosis: “We are keeping him, Dr. Biden, and their entire family in our hearts and prayers during this time.
“Joe is a fighter – and I know he will face this challenge with the same strength, resilience, and optimism that have always defined his life and leadership. We are hopeful for a full and speedy recovery.”
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1:16
Mr Biden’s diagnosis: What we know
Former US president Bill Clinton wrote on social media: “My friend Joe Biden’s always been a fighter. Hillary and I are rooting for him and are keeping him, Jill, and the entire family in our thoughts.”
Hillary Clinton, who unsuccessfully ran for president in 2016, said she was “thinking of the Bidens as they take on cancer, a disease they’ve done so much to try to spare other families from”.
Speaker of the US House of Representatives Mike Johnson said it was “sad news” and his family “will be joining the countless others who are praying” for Mr Biden.
Former House speaker Nancy Pelosi described Mr Biden as a “great American patriot” and said she was “praying for him to have strength and a swift recovery”.
Mr Trump’s secretary of state, Marco Rubio, wrote on social media that he and his wife were “united in prayer for the Biden Family during this difficult time”.
US President Donald Trump said he was “saddened” by the news, adding: “We extend our warmest and best wishes to Jill and the family, and we wish Joe a fast and successful recovery.”
Former US president Barack Obama said: “Michelle and I are thinking of the entire Biden family.
“Nobody has done more to find breakthrough treatments for cancer in all its forms than Joe, and I am certain he will fight this challenge with his trademark resolve and grace. We pray for a fast and full recovery.”
Image: Barack Obama (right) with Joe Biden at a campaign event in 2022. File pic: Reuters
British Prime Minister Sir Keir Starmer said he was “very sorry to hear President Biden has prostate cancer”.
“All the very best to Joe, his wife Jill and their family, and wishing the President swift and successful treatment,” he added.
After a poor debate performance against Mr Trump and amid escalating concerns for his health, Mr Biden withdrew from the 2024 election and endorsed his vice president Kamala Harris.
Ms Harris wrote on X: “We are keeping him, Dr. Biden, and their entire family in our hearts and prayers during this time.
“Joe is a fighter – and I know he will face this challenge with the same strength, resilience, and optimism that have always defined his life and leadership. We are hopeful for a full and speedy recovery.”
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1:16
Mr Biden’s diagnosis: What we know
Former US president Bill Clinton wrote on social media: “My friend Joe Biden’s always been a fighter. Hillary and I are rooting for him and are keeping him, Jill, and the entire family in our thoughts.”
Hillary Clinton, who unsuccessfully ran for president in 2016, said she was “thinking of the Bidens as they take on cancer, a disease they’ve done so much to try to spare other families from”.
Speaker of the US House Of Representatives Mike Johnson said it was “sad news” and his family “will be joining the countless others who are praying” for Mr Biden.
Former House speaker Nancy Pelosi described Mr Biden as a “great American patriot” and said she was “praying for him to have strength and a swift recovery”.
Mr Trump’s secretary of state, Marco Rubio, wrote on social media he and his wife were “united in prayer for the Biden Family during this difficult time”.
Following President Trump’s Middle East trip – which the White House is touting as an unbridled success – Sky News’ Martha Kelner sits down with Barbara Leaf, who was US ambassador to the United Arab Emirates during Trump’s first term and assistant secretary of state for Near Eastern affairs in the Biden administration.
She was also in the team that formed the first formal US presence in Syria after more than a decade.