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Prime Minister Boris Johnson has told “so many lies” during the Brexit campaign, the outgoing president of the European Commission, Jean-Claude Juncker, has claimed.

Mr Juncker, whose term at the helm of the European executive will come to an end by January 2020, also said he had been “firmly convinced” the referendum “would go wrong”.

The former prime minister of Luxembourg, speaking to German magazine Der Speigel, said he made a £1 gain from the Leave vote in 2016.

He told the publication: “I was one of those early on who was firmly convinced that this referendum would go wrong.When then-prime minister David Cameron told me on the sidelines of the 2014 G20 summit in Brisbane that he really wanted to hold a Brexit referendum, I told him ‘You’re going to lose it.’ I made a bet with the European commissioner of British nationality at the time, Jonathan Hill: I get a pound from you if the Remainers lose, you get a euro if you win -I have that pound coin  today.”