Jean-Claude Juncker: Career insider or committed European?
27 June 2014 Last updated at 22:54 BST
The man at the centre of the controversy, Jean-Claude Juncker, is a former prime minister of Luxembourg and one of the architects of the euro.
Now that he has been nominated for the top job at the European Commission, how is the EU likely to work under his leadership - and how will Britain work with him?
Europe editor Gavin Hewitt reports.