Australia's opposition leader Tony Abbott today threatened to bring down Julia Gillard's fragile minority government, one day after it was sworn in, by persuading independent MPs to support him. Neither leader won an outright majority at the August 21 polls but Gillard's ruling Labour party was returned to office after the prime minister managed to broker the support of minority lawmakers. But Abbott said he was determined to lure two rural kingmaker independents to his side by convincing them that Labour's planned national broadband network was a wasteful mistake — a move that would smash Gillard's hold on power.