“The idea is to kill the idea of a second referendum,” a eurozone diplomat said as quoted by the media on Thursday.
Besides, the clause would make impossible post-referendum negotiation on the UK membership in the European Union.
UK Prime Minister David Cameron is seeking to revise the terms of his country's membership to the bloc having outlined his demands to Brussels, which center on four key issues — shifting power away from EU authorities back to the UK national legislature, exempting Britain from the EU "superstate" principle, denouncing the euro as the single official EU currency, and protecting the British economy by keeping eurozone members away from non-eurozone countries’ affairs.
On Wednesday, European Council President Donald Tusk said there were no guarantees on EU reforms demanded by London ahead of Britain’s in/out referendum scheduled to be held no later than the end of 2017.