The caller questioned his mistrust of the Prime Minister and blasted him for his pro-EU stance, with the politician calling for a second referendum on a Brexit deal.
Cutting in to reply to the irate caller, Mr Farron said: “I trust you more than Theresa May, how about that?”
The caller continued: “How can you trust [Jean-Claude] Juncker and [Donald] Tusk and people running the EU?”
Tim Farron was blasted by radio callers for his stance on Brexit
They [the public] didn’t vote to leave the single market because it wasn’t on the ballot paper
But the Lib Dem leader admitted he did not trust them either and predicted the UK would get “stitched up”.
He replied: “I don’t [trust Mr Juncker and Mr Tusk], I don’t – we’re going to get a deal stitched up by our politicians and their politicians.
“I don’t trust either of them, I trust the people.”
Another “outraged” caller, who normally votes Liberal Democrat, blasted Mr Farron for having “taken my vote away”.
Snap election 2017: The pictures politicians may not want you to see Sat, May 27, 2017
Protests, fights and daleks, it's all happening as the politicians hit the campaign trail for the snap election
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Jeremy Corbyn during a visit to Hackney Marshes Football Pitches, to highlight Labour's manifesto commitment to ensure 5% of the Premier League's television rights income is diverted to the grassroots game, during a General Election campaign
Theresa May meeting with Jean-Claude Juncker earlier this year
She said: “I am 66 years-old and I have voted in every election as a Liberal Democrat. You have taken my vote away from me because you are trying to overturn the referendum.
“No good saying ‘oh we only want to be in the single market, we’re accepting the voice of the people’ – no you’re not, the voice of the people said ‘we want to leave the EU’ – that meant leaving the common market… how dare you do that to me.”
But the politician insisted leaving the single market “wasn’t on the ballot paper” and that Mrs May was merely “interpreting the will of the people – not enacting it”.
He said: “They [the public] didn’t vote to leave the single market because it wasn’t on the ballot paper.
“You’re entitled to your view that when you voted to leave the European Union, you meant out of the single market but it wasn’t on the ballot paper.
“Somebody else could have voted Leave and be of the view that actually we want that free trade deal.”