Senior Australian politicians on Thursday insisted the country's sports minister was not a "spy" for Washington after WikiLeaks cables reportedly revealed he was a "protected" source for the United States.
Mark Arbib, a key figure in June's overthrow of former leader Kevin Rudd, was a valued contact in Canberra and met US diplomats "repeatedly" according to WikiLeaks memos published exclusively by the Sydney Morning Herald.
Elevated from minor portfolios to the sports ministry following Australia's August elections, Arbib was described as a "right-wing powerbroker and political rising star" who was influential in Rudd's inner circle.
He kept US officials briefed on the inner workings of Australia's government and ruling Labor party, according to the Herald report, including candid commentary ahead of Rudd's overthrow by his deputy, Julia Gillard.
"(Rudd wants) to ensure that there are viable alternatives to Gillard within the Labor party to forestall a challenge," Arbib reportedly told US diplomats, some eight months before the coup.
Senior politicians were quick to defend Arbib, including fellow coup architect Bill Shorten, now the assistant treasurer.
"I completely reject the idea that he is a spy, I just think that's nonsense," Shorten told Sky News.
"I think that the commentary I've seen this morning in the newspapers is dinner party gossip masquerading as US intelligence... Each week someone's got to send a report off to America, so they jot down gossip and conversation," he added.
Health minister Nicola Roxon said there was "nothing extraordinary about people meeting and talking with diplomats" and urged against reading "anything at all sinister into that."
The Herald said WikiLeaks cables also showed that the US took a keen interest in the rise of Gillard, now Australia's prime minister, and saw her as the "front-runner" to replace Rudd as early as June 2008.
"Many (party) figures" offered assurances of her pragmatism, according to the leaked memos, assuaging US concerns that she was ambivalent about Australia's alliance with Washington.
"Labor party officials have told us that one lesson Gillard took from the 2004 elections was that Australians will not elect a PM who is perceived to be anti-American," one cable reportedly read.