THE OPPOSITION finance spokesman, Barnaby Joyce, believes the United States government could default on its debt, triggering an ''economic Armageddon'' which will make the recent global financial crisis pale into insignificance.

Senator Joyce told the Herald yesterday he did not mean to alarm the public but there needed to be a debate about Australia's ''contingency plan'' for a sovereign debt default by the US or even by a local state government.

''A default by the US means complete economic collapse around the world and the question we have got to ask ourselves is where are we in that,'' Senator Joyce said.

His warning came as the Rudd Government ramped up its attack on Senator Joyce as an economic extremist by highlighting his strong opposition to Chinese sovereign investment in Australia.

The Treasurer, Wayne Swan, said it was a cause for concern that Senator Joyce had been elevated ''from the reactionary fringe of our economic debate to the second-most senior economic policymaking job in the alternative government''.

The scrutiny of foreign investment bids was adequate and ''if we were to follow the advice of some of the extremists on foreign investment, it could cost something like 20,000 jobs right across Australia''.

Senator Joyce said the chances of a US debt default were distant but real and politicians were not doing the electorate a favour by refusing to acknowledge the risk.

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