The far-right UK Independence Party has been forced to deny its controversial former leader, Nigel Farage, is coaching Donald Trump ahead of the second presidential debate.

Reports emerged on Saturday that Farage has already flown to the US to team up with Trump ahead of the second debate, which will take place on October 9 at Washington University in St. Louis, Missouri.

The party denied Farage had teamed up with Trump, but refused to confirm or deny if the former leader would travel to the US in the near future, the Guardian reports.

Nigel Farage (left) has reportedly agreed to team up with Donald Trump and coach the Republican candidate for the final two presidential debates

The Republican nominee is expected to have Farage stick around until at least October 19, when the third and final president debate will take place.

If Trump does rely on Farage to help him get ready for the debate, it will be the second time the controversial Briton has been brought on-board to help with the campaign.

The two far-right leaders appeared together during a rally in Mississippi in August.

Speaking to Trump's supporters, Farage said: 'If I was an American citizen, I wouldn’t vote for Hillary Clinton if you paid me.'

The far-right UK Independence Party has been forced to deny Farage (pictured), its former leader, has left the UK to work with Trump

The Republican nominee is expected to have Farage stick around until at least October 19, when the third and final president debate will take place

'In fact, I wouldn’t vote for Hillary Clinton if she paid me,' he added.

Trump heaped praise on Farage at the rally, calling him 'the man behind Brexit' when introducing him to the crowd.

The Republican nominee has repeatedly drawn comparisons between his campaign and the successful 'Leave' vote in the UK earlier this year, suggesting both are about 'taking the country back'.

'Just arrived in Scotland. Place is going wild over the vote. They took their country back, just like we will take America back!' Trump tweeted in June.

Donald Trump and Nigel Farage appeared together during a rally in Mississippi in August

Speaking to Trump's supporters in August, Farage said: 'If I was an American citizen, I wouldn’t vote for Hillary Clinton if you paid me'

'They will soon be calling me MR BREXIT,' he tweeted in August.

Farage has strong ties to Trump's recently appointed campaign chief executive, Stephen Bannon.

Bannon had been executive chairman of the right-wing outlet Breitbart News before he stepped down to join Trump's campaign.