The head of Australia's peak spy agency, ASIO, says matters of national security shouldn't be politicised.

But it's a bit late for that: All this week, the Federal Government's been on the attack, after it was revealed China had tried but failed to target potential Labor Party candidates in New South Wales ahead of the election.

Today, the host of Insiders on ABC TV, David Speers, on the prime minister's 'reds under the beds' scare campaign.

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David Speers, Host, ABC TV Insiders