Donald Trump has won enough delegates to become the Republican presumptive nominee for a third straight election.
He joins Joe Biden as his party’s presumptive presidential nominee, after he earlier clinched enough delegates to take the Democratic Party’s nomination.
It means the sitting president is expected to face Mr Trump in the election later this year – a re-run of the 2020 vote.
This will be the first time since 1956 that the same two candidates have faced each other in back-to-back elections.
And the campaign will almost certainly deepen the nation’s political and cultural divides in the eight-month fight for the White House.
Mr Trump won the nomination after contests on Tuesday in Georgia, Hawaii, Mississippi and Washington having already vanquished all his primary opponents.
Mr Biden too faced little opposition in his primary.
He released a statement after clinching the nomination, in which he said: “Voters now have a choice to make about the future of this country.
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“Are we going to stand up and defend our democracy or let others tear it down? Will we restore the right to choose and protect our freedoms or let extremists take them away? Will we finally make the wealthy pay their fair share in taxes – or will we allow corporate greed to run rampant on the backs of the middle class?”
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How does the US election work?
NBC News correspondent Mike Memoli said the result was “not a surprise” given the current president was running against “token opposition” – including Californian Governor Gavin Newsom and Michigan Governor Gretchen Whitmer – who sat out rather than challenge Mr Biden who had already beaten his predecessor once before.
On Monday, before the result, Mr Trump predicted Mr Biden would be the Democratic nominee as he unleashed a new attack on the president’s age.
“I assume he’s going to be the candidate. I’m his only opponent other than life, life itself,” Mr Trump told CNBC.
Mr Biden directed much of his attention towards the former Republican president during a campaign stop in New Hampshire on Monday night.
He described his opponent as a “serious threat to democracy”.
The campaign has not been without difficulties for both frontrunners.
Mr Trump is facing 91 felony counts in four criminal cases involving his handling of classified documents and his attempt to overturn the 2020 election, among other alleged crimes.
He is also facing increasingly pointed questions about his policy plans and relationships with some of the world’s most dangerous dictators.
And 81-year-old Mr Biden is working to assure a sceptical electorate that he is still physically and mentally able to thrive in one of the world’s most difficult jobs.
He is also dealing with dissent within his party’s progressive base, which is angry he has not done more to stop Israel’s war against Hamas in Gaza.
Mr Biden entered Tuesday 102 delegates short of the 1,968 needed to formally become the presumptive Democratic nominee.
Mr Trump was 137 delegates short of the 1,215 needed to win the Republican nomination at the party’s national convention this summer.
There are mechanisms to protect the regime in events like this and the Revolutionary Guard, which was founded in 1979 precisely for that purpose, will be a major player in what comes next.
In the immediate term, vice-president Mohammed Mokhber will assume control and elections will be held within 50 days.
Mokhber isn’t as close to the supreme leader as Raisi was, and won’t enjoy his standing, but he has run much of Khamenei’s finances for years and is credited with helping Iran evade some of the many sanctions levied on it.
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1:12
Drone footage of helicopter crash site
Raisi’s successor will most likely be the chosen candidate of the supreme leader and certainly another ultra-conservative hardliner – a shift back to the moderates is highly unlikely.
Likewise, we shouldn’t expect any significant change in Iran’s foreign activities or involvement with the war in Gaza. It will be business as usual, as much as possible.
However, after years of anti-government demonstrations following the death of Mahsa Amini in 2022, this might be a moment for the protest movement to rise up and take to the streets again.
Iranian protesters have expressed “joy” over the death of President Ebrahim Raisi who was dubbed the “Butcher of Tehran”.
Speaking to Sky News’ The World With Yalda Hakim, three Iranians spoke on the condition of anonymity over fears of being tracked down by the country’s regime.
A protest leader – who is currently in hiding – suggested Sunday’s crash, that also killed Iran’s foreign minister, was “pre-planned”.
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Rescuers reach helicopter crash site
“We may not be across everything, but it’s been a known fact for a long time that Raisi was a serious contender to replace the Supreme Leader Khamenei, and perhaps some didn’t want that to happen.
“But all in all, this was very good news.
“All I can say is that the only thing that has made me truly happy over the past five years has been the news of Raisi’s death.”
Mr Raisi’s time in charge included major protests over Mahsa Amini – the woman who died after she was arrested for allegedly not wearing her hijab properly.
The US said Mr Raisi had “blood on his hands” as the former hardline cleric was “a brutal participant in the repression of the Iranian people for nearly four decades”.
From the voices speaking out on The World with Yalda Hakim from inside Iran there was a sense of celebration on the eve of the funeral of their dead president but also a sense of realism.
One dead president the fall of a regime does not make. That is the bitter truth for those brave Iranians speaking out and the millions of Iranians they represent. They detest a man who presided over a brutal crackdown on protests that saw hundreds killed on the streets, and thousands incarcerated, tortured, raped or killed after their arbitrary arrest.
But there are reasons for Iranians to find some hope in the news of the president’s death.
Analysts have compared the Iranian theocratic Islamic regime to the Soviet Union in its dying days.
It is ideologically bankrupt. Its people do not believe in what it stands for anymore. It is morally bankrupt too, after the brutal repression that crushed the Women, Life and Freedom protests. But it remains powerful, with many people on its payroll and it is hard to predict how or when it falls.
Iran’s people want one thing though, and its government the opposite, and that ultimately is impossible to sustain.
Raisi had a unique skill set. He was both a zealous idealogue and an ex-judge. A man who understood how both Iran’s judiciary and presidency works. He combined a passionate belief in the Iranian revolution with an expertise in how its regime operated.
It has been said many times in the last 24 hours that Ayatollah Khamenei, Iran’s supreme leader, will find another hardliner to replace him. There are plenty more where he came from.
But no one with quite his skills and expertise. That may not be important immediately but at the moment of greatest danger in the not so distant future when Khamenei dies, it could make all the difference.
With no anointed successor, the supreme leader’s passing could usher in a period of instability and weakness for the regime. Raisi was seen as a potential successor but also a powerful stabilising force as president in that perilous hiatus, someone who could hold the ring while the new order is established and power struggles fought out.
Raisi’s death may well not mean immediate change for Iran but it could ultimately hasten its end.
A housewife, who was beaten up for taking parting in the “Woman, Life, Protest” movements, said: “The public hatred towards this regime is not a secret to anyone.
“Raisi’s death proved that the pain that this inflicted on our people will one day hit them back.
“My personal reaction to the death of Raisi… I was very happy.
“I’m not upset at all. Even though I never wish death on anyone, but this man, not only did he not do anything for our nation, but he ordered the death of countless young innocent people.”
Following news of Mr Raisi’s death, US State department spokesperson Matt Miller said the Iranian president “was involved in numerous horrific human rights abuses, including playing a key role in the extra judicial killing of thousands of political prisoners in 1988”.
“Some of the worst human rights abuses occurred during his tenure as president, especially the human rights abuses against the women and girls of Iran,” he added.
The US approach to Iran “will not change” because of Mr Raisi’s death, Mr Miller said.
There are mechanisms to protect the regime in events like this and the Revolutionary Guard, which was founded in 1979 precisely for that purpose, will be a major player in what comes next.
In the immediate term, vice-president Mohammed Mokhber will assume control and elections will be held within 50 days.
Mokhber isn’t as close to the supreme leader as Raisi was, and won’t enjoy his standing, but he has run much of Khamenei’s finances for years and is credited with helping Iran evade some of the many sanctions levied on it.
Please use Chrome browser for a more accessible video player
1:12
Drone footage of helicopter crash site
Raisi’s successor will most likely be the chosen candidate of the supreme leader and certainly another ultra-conservative hardliner – a shift back to the moderates is highly unlikely.
Likewise, we shouldn’t expect any significant change in Iran’s foreign activities or involvement with the war in Gaza. It will be business as usual, as much as possible.
However, after years of anti-government demonstrations following the death of Mahsa Amini in 2022, this might be a moment for the protest movement to rise up and take to the streets again.