Donald Trump and Kamala Harris have one last day to win over voters in a US presidential campaign which will only be played in a handful of states.

THE vice-president spends all day Monday in Pennsylvania, a crucial state that offers 19 electoral votes and is expected to determine the outcome.

His gathering in Philadelphia will include figures like Lady Gaga And Oprah Winfrey.

In the meantime, Donald Trump plans four rallies in three states: North Carolina, Pennsylvania and finally Michigan.

US elections: colleges, swing states and how it all works

In an interview with NBC, Mr. Trump said former presidential candidate Robert F. Kennedy Jr. would have an “important role” in his administration.

Mr Kennedy, a vaccine skeptic and nephew of former US President John F. Kennedy, withdrew as an independent candidate before supporting Mr Trump for president.

Mr. Trump has not ruled out the possibility of banning certain vaccines during his second term.

“Well, I’ll talk to (Kennedy) and talk to other people, and I’ll make a decision, but he’s a very talented guy and he has strong opinions,” he told NBC .

On Friday, Mr. Kennedy said in an article on X that a Trump administration would push to ban fluoride in water on its first day in office, saying it was “industrial waste” that led to problems like cancer and other diseases.

More than 77 million Americans have already voted before election week, according to the University of Florida Election Laboratory. This represents almost half of the 160 million votes returned in 2020.

But swing states, also known as battleground states, have a disproportionate influence on presidential elections because they alternate between voting Republican and voting Democratic.

This is why the two candidates have concentrated their campaigns in recent days in Wisconsin, Pennsylvania, Georgia, Arizona, North Carolina, Michigan and Nevada.

Heading into Monday, Ms Harris has now all but stopped mentioning Mr Trump – she has instead tried to focus on forward-looking themes.

At a rally in East Lansing, Michigan, she spoke with some Arab Americans in the state and raised concerns about U.S. support for Israel.

“As president, I will do everything in my power to end the war in Gaza,” she said.

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Meanwhile, Mr Trump repeated that he would bring about “America’s golden age” if elected, while also doubling down on his accusations of election fraud.

In Georgia, he painted a portrait of a second term of the Trump administration: “We are on the eve of the four greatest years in American history. It will be a little unpleasant at times, and perhaps at first in particular.” Mr. Trump did not specify what would be “nasty.”

The polls are tight

The latest election poll by NBC, Sky News’ US partner, finds Ms Harris and Mr Trump tied at 49%, although the margin of error is 3.1 points – a figure that creates a level significant uncertainty as to the outcome.

In Georgia, the race promises to be very close. A recent New York Times poll gives Ms. Harris a one-point lead. Other polls show Mr. Trump narrowly ahead.

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Meanwhile, election officials in Georgia are pushing back against allegations of “election interference” from Mr. Trump and his allies – which appear to be part of efforts to contest the election if he loses.

Mr. Trump also rejected the findings of a shock investigation in Iowa which suggested Ms Harris led by three points in the state, calling it a “fake poll”.

Ms. Harris is in a tight race for Michigan’s 15 electoral college votes, but she is currently just ahead of Mr. Trump in the battleground state.

The stars mobilize to support the candidates

Hollywood actor Robert De Niro was campaigning for vice president this weekend in Pennsylvania, one of the key battleground states.

This is not the first time he has supported Ms Harris. In September, he was joined by fellow actor Steve Buscemi for a live stream to help raise money for Democrats.

Meanwhile, the vice president made a surprise appearance on Saturday Night Live, where she starred in a short sketch alongside Maya Rudolph.

Mr Trump has secured the high-profile support of billionaire business tycoon Elon Musk, who has spent at least $119m (£91.5m) mobilizing his supporters to back the Republican candidate.

In the evening, Sky News will have access to the most comprehensive exit poll and vote counting results from every state, county and demographic group in America via its US partner network NBC.

You can read more about Sky News’ coverage here.