Farage was a key figurehead in the Brexit campaign of 2016, which, with 52 per cent of the vote, won. Jean-Claude Juncker promptly told all UKIP members to leave the Parliament. During the campaign, Farage had made the suggestion of a future second referendum should the Brexit campaign be unsuccessful, but the result be closer than 52–48. Farage accused US President Barack Obama of a "monstrous interference" in the Brexit referendum debate, saying "You wouldn't expect the British Prime Minister to intervene in your presidential election; you wouldn't expect the Prime Minister to endorse one candidate or another."