Britain will reopen attempts to change key sections of the proposed European constitution despite warnings by its chief author that this risks undoing months of painstaking negotiations.
The Government will issue a White Paper in early September setting out its "red lines" - the issues that it will not compromise on - in the final round of bargaining for the constitution that will be launched by European Union leaders in October. Senior officials said the issues include a determination to remove a mutual defence pact that would undermine Nato, clauses regarded as a backdoor attempt to harmonise taxation, and proposals for an EU public prosecutor.

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