There's only a few days remaining until the US election and the race is still neck-and-neck.

Donald Trump and Kamala Harris are holding duelling campaigns in the battleground states as the pair compete for the key to the White House.

Former US Ambassador to New Zealand Mark Gilbert says everyone was expecting a tight race ahead of the big day.

"Polls have been this tight before, but I don't think the race has been this tight before. Everybody thought the Mitt Romney-Barack Obama race in 2012 was this close - but internally, we have ourselves winning 10 of the 12 battleground states."

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