Boris Johnson triggered a round of Tory infighting and a spat with the country's statistics watchdog after setting out his vision for Brexit in 2017.
The then foreign secretary used a 4,000-word essay in the Daily Telegraph to revive the widely-criticised claim that quitting the European Union would allow the UK to take back control of £350 million a week, some of which could be used to boost NHS funding.
The claim first attracted criticism during the referendum campaign in 2016, when Mr Johnson travelled around the country in a bus emblazoned with the slogan 'We send the EU £350 million a week, let's fund our NHS instead'.
Boris Johnson was a key player for Vote Leave, often campaigning on the battlebus which was adorned with the slogan
Mr Johnson was one of the key figures in the Leave campaign and his Telegraph piece was an attempt to show optimism about the Brexit process, to insist that 'this country will succeed in our new national enterprise, and will succeed mightily'.
His revival of the £350 million claim led to a rebuke from UK Statistics Authority chairman Sir David Norgrove, who said it was a 'clear misuse' of official figures.
Brexiteers claimed the figure represented the amount of money the UK does not have control over as a result of EU membership, but it does not include the rebate or take into account any funding that flows back from Brussels.
Michael Gove backed Mr Johnson for reviving the controversial £350 million claim at the time.
The Environment Secretary, who spectacularly torpedoed Mr Johnson's run for the Tory leadership after the Brexit vote, expressed support for his Cabinet colleague and accused critics of trying to 'refight' the referendum.
Mr Gove tweeted: 'In the debate on EU contributions it's important people look at what Boris actually wrote in his Telegraph article, not headlines.