Nigel Farage has said he would not vote for US presidential candidate Hillary Clinton if he was paid, but stopped short of explicitly endorsing her rival Donald Trump.
The outgoing Ukip leader was speaking at a rally for Republican White House hopeful Mr Trump in Jackson, Mississippi.
The majority of his speech focused on the success of the campaign for Britain to leave the EU.
He framed it as a victory for the anti-establishment movement – a theme that is also popular in Mr Trump's campaign.
He said: "Anything is possible if enough decent people are prepared to stand up against the establishment."
Mr Farage condemned President Barack Obama's decision to intervene in the EU referendum and urge Britons to vote Remain.
"I could not possibly tell you how to vote in this election," he said. "But I will say this, if I was an American citizen I wouldn't vote for Hillary Clinton if you paid me."