Václav Klaus, the Czech President, who is the last hurdle to full ratification of the Lisbon treaty, has made a final attempt to derail the agreement.

In a submission to the Czech constitutional court, which will decide tomorrow whether the treaty is compatible with the country’s constitution, Mr Klaus has suggested that it should be subject to a referendum.

The President, who is the only head of state yet to sign the treaty, attacked the EU notion of “shared sovereignty” as a contradiction that effectively means a loss of national control.

President Klaus made his written statement in support of a case against the treaty brought by 17 Czech senators, who have asked judges to rule that the agreement is unconstitutional because it transfers powers to Brussels. He also asked for a ruling on whether the treaty changed the terms of the Czech Republic’s accession to the EU in 2004 so significantly that a new referendum should be ordered.

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