Miranda Devine on Fox & Friends. (Image: Fox News)

Miranda Devine is four months into her American gap year filing columns for the New York Post. But so far, the conservative commentator has failed to command the same influence over an American audience as she does at home.

Devine -- known for, among other things, her obsessions with gender identity and the persecution of white farmers in South Africa -- has continued to push popular conspiracies and mis-characterisations, only this time with US audiences in mind.

She has tried to discredit Greta Thunberg for taking "literally what irresponsible adults have told her, that the planet is going to end in 11 years...", and likened the 16-year-old to a "totalitarian dictator".