TOPSHOT - (COMBO) This combination of pictures created on June 28, 2016 shows United Kingdom Independence Party (UKIP) leader Nigel Farage (L) reacting as he meets with European Union (EU) Commission President Jean-Claude Juncker ahead of a plenary session at the EU headquarters in Brussels on June 28, 2016.
European Commission chief Jean-Claude Juncker called on June 28 on Prime Minister David Cameron to clarify quickly when Britain intends to leave the EU, saying there can be no negotiation on future ties before London formally applies to exit.
 / AFP PHOTO / JOHN THYS        (Photo credit should read JOHN THYS/AFP/Getty Images)