Reform UK leader, Nigel Farage, has accused the Labour Party of "direct election interference" after it emerged almost 100 staff will be sent to the US to support the Harris campaign.
He also pointed out that if Donald Trump were to win the US presidential election, it would harm the UK's relationship with the United States.
Speaking on X, Farage said: "This is direct election interference by the governing Labour Party, and particularly stupid if Trump wins. Who is paying for all of this?"
Former and current Labour employees will spend the next two-and-a-half weeks campaigning for Kamala Harris in four key battlegrounds ahead of the US election on Nov 5.
Nigel Farage blasted Labour's decision to send almost 100 staff to the US
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Labour's Head of Operations said in a post on X: "I have nearly 100 Labour party staff, current and former, going to the US in the next few weeks, heading to North Carolina, Nevada, Pennsylvania and Virginia.
"I have 10 spots available for anyone available to head to the battleground state of [North] Carolina – we will sort your housing."
The Labour activists will need to pay for their own flights and car hire but have been told that Democratic volunteers will provide their accommodation.
Party staff that are attending are also expected to book annual leave for the duration of their trip.
Staff were also emailed on August 2 asking if anybody would be willing to "help our friends across the pond elect their first female President".
The email added: "Let’s show those Yanks how to win elections!"
The move sparked outrage from Republicans who described the plan as an "outrage" and also warned it would damage the UK's relationship with the US if Trump were to win the election.
Sebastian Gorka, a former aide to Trump during his first administration who was born and schooled in the UK, said that Labour officials campaigning for Harris was a "bloody outrage".
Sebastian Gorka, a former aide to Trump during his first administration, described the move as a "bloody outrage"
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"It’s complete interference in American politics and an incredible show of desperation that, not only would this come up as an idea, but that this would be permitted or encouraged by the Kamala campaign," he said.
Reacting to the post on X, Tom Cotton, the Republican senator of Arkansas described it as "yet another reason to vote for President Trump."
The former prime minister, Liz Truss, also shared the post adding: "President Trump is definitely going to win now."
The Federal Election Commission, which regulates US elections, states that foreign volunteers must not donate money to campaigns or spend money on their behalf.
It also states they cannot "participate in the decision-making process" but can, however, participate as an "uncompensated volunteer".