LONDON (AFP) ― British Prime Minister David Cameron will meet with EU Council President Herman van Rompuy in London on Monday to press his case against the appointment of Jean-Claude Juncker as head the European Commission.

The British leader is ready to force fellow EU leaders to vote on who should head the Commission, the EU’s executive arm, in a last ditch attempt to block Juncker, Downing Street sources said Sunday.

Cameron views the former long-serving Luxembourg prime minister as a federalist who will not adopt the modernizing reforms he says the European Union badly needs, and has vowed to “fight this right to the very end.”

European center-left leaders meeting in Paris on Saturday agreed their support for Juncker, the candidate of Europe’s center-right bloc, and the issue is set to dominate a two-day summit of all 28 EU leaders starting on Thursday.

Cameron, who leads Britain’s center-right Conservatives, wants a delay in the nomination process in an effort to find a consensus candidate.

“British officials have been clear ... that if there was the political will to find consensus then the decision on commission president could and should be delayed,” a Downing Street source said.

“But if leaders are not even willing to consider alternative names, despite their widely expressed misgivings, then a vote should take place.”

Previously, EU leaders have agreed the candidate for the presidency among themselves. But under new rules they have to now “take into account” the results of European parliamentary elections last month.

Juncker is the chosen candidate of the European People’s Party, a grouping of center-right parties which is largest single group in the European Parliament.

Cameron’s Conservatives were part of the EPP but he withdrew them in 2009, saying its federalist views were at odds with Tory policy.

He is determined to fight Juncker’s appointment because he sees him as an obstacle to achieving reforms that he believes are necessary to the EU ― and which he has promised to British voters.