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Sky News host Cory Bernardi says US media company CNN is "effectively just a propaganda machine for the left" after Project Veritas caught a network director "boasting about how the network engaged in propaganda".

"Their focus unashamedly was to remove Donald Trump from office. They did this in a two-pronged attack. Firstly, they would concoct stories about Trump to portray him in a negative light and then present images of Biden as a strong and vigorous individual," he said.

"This is clearly more evidence you simply cannot trust what is presented to you by the mainstream media. They are partisan cheerleaders. They create a narrative that suits their agenda. And believe me, it is an agenda.

"This is another case of the left's application of Saul Alinsky's Rules for Radicals in action; you accuse your opponents of what you are guilty of."

Sky News contributor Gemma Tognini told Mr Bernardi "everything about a news organisation is about its reputation" and its credibility.