Lord Mandelson has called on the Conservatives to stop grandstanding for the Ukip vote by demanding a referendum on Britain's membership of the European Union.
The former European Commissioner and Labour Cabinet minister said the EU needed reform but talk of leaving only created uncertainty for investors and would threaten British jobs.
The Labour peer, who was speaking as the European Union (Referendum) Bill reached its second reading in the House of Lords, said he believed it was possible to win the argument for Britain to remain part of the EU if it was put to a public vote.
He said: "We need to concentrate on using all of our influence and energy in building up Britain's influence in Europe, not driving Britain out of Europe.
"This Bill is not about changing or improving the EU, it is indeed stage one in raising impossible demands on the European Union in order to create the pretext for leaving it."
"My message to the Government is stop grandstanding to the Ukip gathering. If you are really serious about European reform, you have to go out and work for it and join with others in achieving it," he added.
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