Pictures taken at the event, a rally to celebrate the returning President's inauguration, appeared to show them exchanging words in a more heated manner. Nigel Farage has denied they had a 'heated exchange'.

The Dubliner is in Washington DC for Donald Trump's inauguration and was pictured with Farage at a rally on Sunday. In the post, McGregor referred to Farage as his 'brother' and tagged Hopkins. He wrote: -"'We are so back!' - @Nigel_Farage #MyBrother @KTHopkins #marriotdc. McGregor also included an Irish flag and Union jag emoji in the post.

The Irishman flew out to Washington for the inauguration of Donald Trump, but has been criticised after pictures emerged online of the MMA star posing with Reform UK leader Nigel Farage

Former two-division UFC champion Conor McGregor has been in attendance in Washington D.C. ahead of the inauguration of Donald Trump for a second term in the White House

Conor McGregor has landed in Washington to attend former US President Donald Trump's inauguration and was pictured with British politician Nigel Farage at a rally

Conor McGregor has been blasted on social media after he was pictured smiling and shaking hands with Reform UK leader Nigel Farage in Washington DC

UFC star Conor McGregor expressed optimism for the future as Donald Trump is set to retake the White House as the 47th president of the United States.

Donald Trump's second presidential inauguration has a heavy combat sports presence. Notables from the UFC, boxing and WWE have flocked to Washington ahead of Trump's inauguration Monday, which officially marks the beginning of his second term as U.