Jean-Claude Juncker

 European Commission President Jean-Claude Juncker (R) makes a joke with tie-less Greek Prime Minister Alexis Tsipras (L) during the second day of the Eastern Partnership Summit in Riga, Latvia, 22 May 2015

Radek Pietruszka/EPA

European Commission President Jean-Claude Juncker (R) makes a joke with tie-less Greek Prime Minister Alexis Tsipras (L) during the second day of the Eastern Partnership Summit in Riga, Latvia on Friday

Jean-Claude Juncker receives David Cameron, British Prime Minister...epa04319307 A handout photograph made available by the European Commission showing new president of the European Commission Jean-Claude Juncker (R) receiving British Prime Minister, David Cameron as EU leaders met in Brussels, Belgium, 17 July 2014.  Jean-Claude Juncker, confirmed by the European Parliament on 15 July 2014 as the next European Commission president with only David Cameron and Hungary's Prime Minister Viktor Orban. EU leaders failed on 16 July 2014 to agree on top political appointments, successors need to be found most urgently for EU foreign policy chief Catherine Ashton and President Herman Van Rompuy.  EPA/LIEVEN CREEMERS / EUROPEAN COMMISSION / HANDOUT  HANDOUT EDITORIAL USE ONLY/NO SALES

Lieven Creemers/EPA

A handout photograph made available by the European Commission shows Jean-Claude Juncker and David Cameron giving each other a high five.