Update: Moments ago, Farage responded on Twitter to the allegations:

In response to the Guardian article, it has taken me a long time to finish reading because I am laughing so much at this fake news. — Nigel Farage (@Nigel_Farage) June 1, 2017

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In what may be the most unexpected news of Thursday morning, the Guardian has reported that former UKIP leader, and the man largely responsible for Brexit, Nigel Farage is a “person of interest” in the FBI's investigation looking into possible collusion between the Kremlin and Donald Trump’s presidential campaign. As the UK newspaper notes, citing "sources with knowledge of the investigation", the former Ukip leader had raised the interest of FBI investigators because of his relationships with individuals connected to both the Trump campaign and Julian Assange, the WikiLeaks founder whom Farage visited in March.

“One of the things the intelligence investigators have been looking at is points of contact and persons involved,” one source said. “If you triangulate Russia, WikiLeaks, Assange and Trump associates the person who comes up with the most hits is Nigel Farage.

So far, Farage has not been accused of wrongdoing and is not a suspect or a target of the US investigation. But being a person of interest means investigators believe he may have information about the acts that are under investigation and he may therefore be subject to their scrutiny.

The Guardian adds that it was Farage’s proximity to people at the heart of the investigation that was being examined as an element in their broader inquiry into how Russia may have worked with Trump campaign officials to influence the US election. “He’s right in the middle of these relationships. He turns up over and over again. There’s a lot of attention being paid to him.”

The source mentioned Farage’s links with Roger Stone, Trump’s long-time political adviser who has admitted being in contact with Guccifer 2.0, a hacker whom US intelligence agencies believe to be a Kremlin agent.

Meanwhile, Farage’s spokesman said he had never worked with Russian officials, and described the Guardian’s questions about Farage’s activities as “verging on the hysterical”.

“Nigel has never been to Russia, let alone worked with their authorities,” the spokesman said. But he did not respond to questions about whether Farage was aware of the FBI inquiry; had hired a lawyer in connection to the matter; or when Farage first met Trump. The spokesman also declined to comment on whether Farage had received compensation from the Russian state-backed media group RT for his media appearances. RT, which has featured Farage about three times over the last 18 months, also declined to comment, citing confidentiality.

Farage said he only met Assange once has but declined to say how long the two have known each other.

In the past, the former Ukip leader has also voiced his support for the Russian president, calling Vladimir Putin the leader he most admired, in a 2014 interview. Ukip also has history with Assange: Gerard Batten, a Ukip member of the European parliament (MEP), defended the Wikileaks founder in a speech in the European parliament in 2011.

One source familiar with the US investigation told the Guardian that the examination of Farage’s activities was considered especially delicate given his role as an MEP.

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While Farage reportedly first met Trump at a campaign stop in Mississippi in August, where he spoke at a Trump campaign event, Farage’s relationships with people close to the US president began years earlier. Farage first met Steve Bannon, Trump’s strategist and former campaign chief executive, in the summer of 2012, when Bannon, who was interested in rightwing movements in Europe, invited the then Ukip leader to spend a few days in New York and Washington, according to an account in the New Yorker magazine.

There Farage was introduced to, among others, the staff of the then senator Jeff Sessions, who is now the US attorney general. Speaking of his longtime admiration for Bannon, Farage told the New Yorker last year: “I have got a very, very high regard for that man’s brain.”

Two years later, in 2014, Breitbart News, of which Bannon was executive chair, opened an office in London. A top editor, Raheem Kassam, later went on to work as Farage’s chief of staff. In 2015, Breitbart News arranged a dinner in Farage’s honour at “the embassy”, the nickname for the house the news group rented in Washington. According to a report in Bloomberg, attendees were “blown away” by Farage’s speech at the event, which was also attended by Sessions. Then, on 24 June last year, the day after the UK voted to leave the EU, Farage thanked Bannon during an interview for Breitbart News’s coverage of the leave campaign. Bannon, in turn, congratulated Farage on his victory, saying he had led an extraordinary “David v Goliath” campaign.

Farage’s ties to Stone are also under scrutiny, it is understood. Stone has frequently publicised his relationship with Assange and described him on Twitter as “my hero”.

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Farage was asked about his relationship with Assange in a recent interview with Die Zeit, the German newspaper, after he was seen on 9 March leaving the Ecuadorian embassy where Assange has lived for years. Farage, who declared he had “never received a penny from Russia”, said he met Assange for “journalistic reasons”. Pressed on his meetings with Russian officials in the past, Farage initially denied having had any, but then acknowledged that he had met Alexander Yakovenko, the Russian ambassador to the UK, in 2013.

Asked by Die Zeit what he was doing now, and whether he saw himself as a politician or a journalist, Farage concluded: “Changing public opinion. That’s what I have been doing for 20 years. Using television, media. Shifting public opinion. That’s what I am good at.”

A spokesman for Farage told the Guardian he had only met Assange on that one occasion. “The meeting was organised by a broadcaster, they could have easily sent another presenter instead.”