rtokens: Clarke denied on Thursday he had threatened to resign and said his position on the single currency was in tune with that of Prime Minister John Major .
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tokens: Marlow 's comment come on the heels of speculation that Clarke had threatened to resign if the government changed its " wait and see " policy on a single currency and declared it would not sign up for the currency in the next Parliament .
ltokens: If he does n't resign , the prime minister has got to fire him . "