Boris Johnson has responded to the European Commission President's questioning of whether his depiction of the EU is "in line with reality".
Jean-Claude Juncker said it was time for Mr Johnson to come back to Brussels "in order to check" what he is telling the British people.
It comes after Mr Johnson recently compared the EU's expansion plans with the European goals of Adolf Hitler.
The former London mayor, and 'Vote Leave' campaigner, told ITV News: "I think what's happening now in Brussels is alarming."
"They are trying to build as I say, a federal structure bubble-gumming together these different countries with a United States of Europe build around a fiscal and political union designed to prop up the euro in which Britain will inevitably be involved."
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