Boris Johnson, mayor of London and a leading figure in the campaign to get Britain out of the European Union, recently launched a pre-emptive strike against an expected U.S. intervention. President Barack Obama is apparently planning to drop by between now and the referendum in June, to help Prime Minister David Cameron and his government by saying, not for the first time, that the United Kingdom shouldn't leave.

Johnson writes:

"The American view is very clear. Whether in code or en clair, the President will tell us all that U.K. membership of the EU is right for Britain, right for Europe, and right for America. And why? Because that — or so we will be told — is the only way we can have 'influence' in the counsels of the nations.