David Cameron will force an unprecedented vote among European leaders on who should be the next European Commission president in a bid to block Jean-Claude Juncker's appointment.
The Prime Minister - who views Juncker as a potential obstacle in his bid to reform the union - will meet with European Council president Herman Van Rompuy on Monday to set out his concerns.
Mr Cameron will call for a vote and expect fellow EU leaders to explain their position on the issue if they are unwilling to consider an alternatives to Mr Juncker.
However, the Prime Minister's attempts to block the appointment look set to fail after nine centre-left leaders declared their support for the former Luxembourg prime minister's nomination.
More top news
PM announces funding will be made available for a memorial dedicated to the victims of last week’s terrorist attack in Tunisia
Mother of the gunman in the Tunisia beach terror attack said her son once refused to kill a mouse because he "couldn't kill anything".
A man who was blasted three times during the Tunisian beach massacre said he shielded his fiancee and told her: "I'm going to die."