Jean-Claude Juncker has threatened to take revenge on Donald Trump for supporting Brexit by launching an independence campaign in the state of Ohio. The European Commission President said the US President should have stayed out of Britain's referendum. Mr Trump weighed in to endorse Brexit last summer while the Republican candidate. He was then assisted on his own campaign by the then Ukip leader Nigel Farage. Since being elected President, Mr Trump has backed voters' decision to quit the EU.