NEW YORK • Star Brexit campaigner Nigel Farage has flown to the US to coach Mr Donald Trump ahead of the Republican presidential nominee's next debate with Democratic rival Hillary Clinton.

Mr Farage, former leader of the UK Independence Party (Ukip), was praised for his debating skills during the European Union referendum campaign in Britain. He will give Mr Trump tips on how to turn the tables on Mrs Clinton at the second presidential debate next Sunday, reported The Daily Mail.

Mr Trump's poor performance at the first debate last week gave Mrs Clinton a boost in the polls and the billionaire businessman's allies say they have pushed him to prepare for the second clash and change his tactics.

The Democrat and former secretary of state pipped Mr Trump by three percentage points in a Fox News poll released on Friday which showed her ahead 43 to 40 per cent.

Mr Farage was expected to help in this regard, according to sources. He is also expected to assist Mr Trump in the build-up to the final clash between the presidential candidates on Oct 19.

Mr Farage, who quit as Ukip leader after the party's longstanding goal of engineering an exit from the EU was achieved in the referendum, has compared Mr Trump's fight with the campaign for Brexit.

In August, Mr Trump introduced Mr Farage at a speech in Mississippi, where the EU parliamentarian said: "I wouldn't vote for Clinton if you paid me."

Mr Trump's advisers intend to drill him on answers, facts and counterattacks ahead of the debate on Oct 9, including coaching him on how to attack Mrs Clinton on issues even if he is not asked about them.

But whether he is open to practising is a major concern, according to The New York Times.