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EU row: Cameron has 'low opinion of British people'

Work and Pensions Secretary Iain Duncan Smith has accused the Prime Minister of having "a low opinion of the British people" by downplaying the UK's prospects if it left the EU.

It comes after a Sunday newspaper column in which David Cameron accused MPs backing an EU exit of wanting to take "the gamble of the century" with the country's future.

Amid rising tensions between the pro- and anti-Brexit camps, Mr Cameron has reportedly been threatened with a challenge to his leadership unless he tones down attacks on MPs backing the "leave" campaign.

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G20 countries say Brexit would 'shock' world economy

The world's leading economies have warned that a British exit from the EU could cause a "shock" to the world economies.

Finance ministers from the G20 countries flagged the vote among key risks to world growth at a meeting in Shanghai.

Speaking after the meeting, the US Treasury Secretary Jack Lew said it was in the interests of the world for the UK to stay in the bloc.

Our view is that it's in the national security and economic security of the United Kingdom, of Europe and of the United States for the United Kingdom to stay in the European Union.

– Jack Lew

The British chancellor George Osborne told the meeting that there would be risks to jobs, living costs and living standards should voters opt to leave.

This isn't some adventurous journey into the unknown with all the humour attached to it. This is deadly serious.

– George Osborne

It comes as David Cameron told voters in Northern Ireland that leaving the EU would be like taking a "leap in the dark".

The Prime Minister said this was because more than 60% of Northern Ireland's exports go to the EU and around 40% of its investments come from there.

Treasury figures put the number of jobs there at risk, which are linked to EU trade, at 50,000.

The UK will vote on whether to stay in the EU or leave in a referendum on June 23.

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