Former Tory leader backs David Cameron to stick to veto over EU powers amid claims PM has rowed back on pledge The work and pensions secretary, Iain Duncan Smith, has said Britain would block eurozone countries from using institutions paid for by EU nations. Pressed on the possible use of the European commission and courts, which are funded by EU countries, in the push for deeper fiscal and political union among the 17 single currency members states, Duncan Smith said the prime minister had vetoed “any such possibility”. The former Tory leader insisted he had absolute “trust” in David Cameron to stick to the veto, amid mounting speculation the prime minister has rowed back on the pledge ahead of Monday’s EU summit.