Sadiq Khan has attacked the EU referendum 'Remain' campaign, which he supports, for making doom-laden "nonsense" predictions about the consequences of Brexit.
The Labour mayor of London said on Sunday said a "positive case" for EU membership needed to be made.
"I think both sides have been doing a bit too much project fear. One side is saying if we remain in the European Union it’s the end of time. The other side is saying if we leave the European it’s the end of the world as you know it," he told ITV's Peston on Sunday programme.
"I think that the public just realises they’re both talking nonsense and my point is there are less than four weeks to go until the most important vote in a generation."
Khan's comments come as the Tory civil war over Europe deepened, with one Conservative backbencher revealing on live television she had already formally called for David Cameron to resign as prime minister.
Jeremy Corbyn has refused to share a pro-EU platform with Cameron during the referendum campaign.
However Khan is expected to join the prime minister on the 'Remain' battle bus tomorrow.
Explaining his decision, he told ITV: "Is it in London’s interest for me to hold grudges? Is it in London’s interests for the Mayor of London to be at permanent war with the Conservative Prime Minister?"
"I’m willing to put aside our differences, put aside the grudges that he or our side may have, because this argument, this debate, is far more important than David Cameron or me."
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